Add PKCS#12 documentation and new option in x509 to add certificate extensions.

Remove NOPROTO definitions and error code comments.

Change #include filenames from <foo.h> to <openssl.h>.

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PR:

Change functions to ANSI C.

Massive constification.

Fix security hole.

Add functions to add certs to stacks, used for CA file/path stuff in servers.

Fix version stuff:

1. The already released version was 0.9.1c and not 0.9.1b

2. The next release should be 0.9.2 and not 0.9.1d, because
first the changes are already too lar

Fix version stuff:

1. The already released version was 0.9.1c and not 0.9.1b

2. The next release should be 0.9.2 and not 0.9.1d, because
first the changes are already too large, second we should avoid any more
0.9.1x confusions and third, the Apache version semantics of
VERSION.REVISION.PATCHLEVEL for the version string is reasonable (and here
.2 is already just a patchlevel and not major change).
tVS: ----------------------------------------------------------------------

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Fix for sk_insert bug: it never worked properly.
Allow explicit tag asn macros to handle indefinite length constructed stuff:
without this certain "certificates" can't be read in.

*** empty log message ***

Switch version string to SSLeay/OpenSSL

Various cleanups and fixed by Marc and Ralf to start the OpenTLS project

Import of old SSLeay release: SSLeay 0.9.1b (unreleased)

Import of old SSLeay release: SSLeay 0.9.0b

Import of old SSLeay release: SSLeay 0.8.1b