sasl: Combined DIGEST-MD5 message decoding and generation

email: Added support for cancelling NTLM authentication

email: Added support for cancelling DIGEST-MD5 authentication

email: Corrected a couple of typos from 1e39b95682781f

email: Added support for canceling CRAM-MD5 authentication

sasl: Centralised the authentication mechanism strings

Moved the standard SASL mechanism strings into curl_sasl.h rather than
hard coding the same values over and over again in the proto

sasl: Centralised the authentication mechanism strings

Moved the standard SASL mechanism strings into curl_sasl.h rather than
hard coding the same values over and over again in the protocols that
use SASL authentication.

For more information about the mechanism strings see:

http://www.iana.org/assignments/sasl-mechanisms

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SASL: fix compiler warnings

comparison between signed and unsigned integer expressions

suggest parentheses around '&&' within '||' (twice)

sasl: added basic SASL XOAUTH2 support

Added the ability to generated a base64 encoded XOAUTH2 token
containing: "user=<username>^Aauth=Bearer <bearer token>^A^A"
as per RFC6749 "OAu

sasl: added basic SASL XOAUTH2 support

Added the ability to generated a base64 encoded XOAUTH2 token
containing: "user=<username>^Aauth=Bearer <bearer token>^A^A"
as per RFC6749 "OAuth 2.0 Authorization Framework".

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sasl: Reworked SASL mechanism constants

... to use left-shifted values, like those defined in curl.h, rather
than 16-bit hexadecimal values.

sasl: Added predefined preferred mechanism values

In preparation for the upcoming changes to IMAP, POP3 and SMTP added
preferred mechanism values.

sasl: Corrected a few violations of the curl coding standards

Corrected some incorrectly positioned pointer variable declarations to
be "char *" rather than "char* ".

Revert changes relative to lib/*.[ch] recent renaming

This reverts renaming and usage of lib/*.h header files done
28-12-2012, reverting 2 commits:

f871de0... build: make use

Revert changes relative to lib/*.[ch] recent renaming

This reverts renaming and usage of lib/*.h header files done
28-12-2012, reverting 2 commits:

f871de0... build: make use of 76 lib/*.h renamed files
ffd8e12... build: rename 76 lib/*.h files

This also reverts removal of redundant include guard (redundant thanks
to changes in above commits) done 2-12-2013, reverting 1 commit:

c087374... curl_setup.h: remove redundant include guard

This also reverts renaming and usage of lib/*.c source files done
3-12-2013, reverting 3 commits:

13606bb... build: make use of 93 lib/*.c renamed files
5b6e792... build: rename 93 lib/*.c files
7d83dff... build: commit 13606bbfde follow-up 1

Start of related discussion thread:

http://curl.haxx.se/mail/lib-2013-01/0012.html

Asking for confirmation on pushing this revertion commit:

http://curl.haxx.se/mail/lib-2013-01/0048.html

Confirmation summary:

http://curl.haxx.se/mail/lib-2013-01/0079.html

NOTICE: The list of 2 files that have been modified by other
intermixed commits, while renamed, and also by at least one
of the 6 commits this one reverts follows below. These 2 files
will exhibit a hole in history unless git's '--follow' option
is used when viewing logs.

lib/curl_imap.h
lib/curl_smtp.h

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build: make use of 76 lib/*.h renamed files

76 private header files renamed to use our standard naming scheme.

This change affects 322 files in libcurl's source tree.

sasl: Re-factored mechanism constants in preparation for APOP work

sasl: Renamed Curl_sasl_decode_ntlm_type2_message()

For consistency with other SASL based functions renamed this function
to Curl_sasl_create_ntlm_type3_message() which better describes

sasl: Renamed Curl_sasl_decode_ntlm_type2_message()

For consistency with other SASL based functions renamed this function
to Curl_sasl_create_ntlm_type3_message() which better describes its
usage.

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sasl: Added service parameter to Curl_sasl_create_digest_md5_message()

Added a service type parameter to Curl_sasl_create_digest_md5_message()
to allow the function to be used by differe

sasl: Added service parameter to Curl_sasl_create_digest_md5_message()

Added a service type parameter to Curl_sasl_create_digest_md5_message()
to allow the function to be used by different services rather than being
hard coded to "smtp".

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sasl: Moved digest-md5 authentication message creation from smtp.c

Moved the digest-md5 message creation from smtp.c into the sasl module
to allow for use by other modules such as pop3.

sasl: Small code tidy up before moving digest-md5 over

Correction of comments and variable names.

sasl: Moved cram-md5 authentication message creation from smtp.c

Moved the cram-md5 message creation from smtp.c into the sasl module
to allow for use by other modules such as pop3.

sasl: Corrected variable names in comments and parameters

sasl: Small comment style tidy up following ntlm commit

sasl: Moved ntlm authentication message handling from smtp.c

Moved the ntlm message creation and decoding from smtp.c into the sasl
module to allow for use by other modules such as pop3.

sasl: Moved login authentication message creation from smtp.c

Moved the login message creation from smtp.c into the sasl module
to allow for use by other modules such as pop3.

sasl: Moved plain text authentication message creation from smtp.c

Moved the plain text message creation from smtp.c into the sasl module
to allow for use by other modules such as pop3.

sasl: Re-factored auth-mechanism constants to be more generic