Prevent multiple initialization of memdebug configuration variables.

This was possible on debug c-ares enabled builds when both CURL_MEMDEBUG
and CARES_MEMDEBUG environment variables wer

Prevent multiple initialization of memdebug configuration variables.

This was possible on debug c-ares enabled builds when both CURL_MEMDEBUG
and CARES_MEMDEBUG environment variables were set. Leading to a file handle
leak even when both variables had the same value, and wierd test suite
results when different.

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Ifdef around S_IRGRP and S_IROTH (meaningless on Win32).

add a couple more of debugging messages

SCP support added

Olaf Stueben provided a patch that I edited slightly. It fixes the notorious
KNOWN_BUGS #25, which happens when a proxy closes the connection when
libcurl has sent CONNECT, as part of an auth

Olaf Stueben provided a patch that I edited slightly. It fixes the notorious
KNOWN_BUGS #25, which happens when a proxy closes the connection when
libcurl has sent CONNECT, as part of an authentication negotiation. Starting
now, libcurl will re-connect accordingly and continue the authentication as
it should.

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initial SCP support is now added

Update the information about what c-ares version that's required. 1.3.1 had
a fatal bug so we must require 1.3.2 to get flawless functionality with c-ares.

stand clear for release 1.3.2

Andreas Rieke added missing file and changed line endings

reduce max size of dinamically allocated arrays to minimize the nasty
behaviour some versions of IRIX exhibit of committing suicide on big
mallocs instead of just returning a friendly null po

reduce max size of dinamically allocated arrays to minimize the nasty
behaviour some versions of IRIX exhibit of committing suicide on big
mallocs instead of just returning a friendly null pointer

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fix missing '$' for var OPT_LIBSSH2

update copyright year

fix comments and renumber rlimit return codes
fix closing of fd's when limit is reached

fix comments and renumber rlimit return codes

update the counter

mention the new options

James Housley brought support for SCP transfers

remove leftover comment

update and split test cases 518 and 537 into its own source code file

code cleanup

use our internal string functions and replace sprintf with snprintf

Update protocol verification end of lines

check symbol HAVE_UNISTD_H instead of UNISTD_H to include unistd.h

prototype for gethostname is in unistd.h

test 518 is all about testing libcurl functionality
when more than FD_SETSIZE file descriptors are open.
This means that if for any reason we are not able to
open more than FD_SETSIZE fil

test 518 is all about testing libcurl functionality
when more than FD_SETSIZE file descriptors are open.
This means that if for any reason we are not able to
open more than FD_SETSIZE file descriptors then test
518 should not be run.

test 537 is all about testing libcurl functionality
when the system has nearly exhausted the number of
free file descriptors. Test 537 will try to run with
very few free file descriptors.

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