* Added AuthExternalContext directive, which defines a string that will be
passed to the authenticator in the CONTEXT environment variable. This can
be set from the .htaccess file or the <Directory> block to give slightly
different behavior from the same authenticator in different directories.
Thanks to Olivier Thauvin <nanardon at mandriva dot org> for this patch.
* Rewrite external authenticator launching code to use Apache's cross-OS
process/thread library instead of directly calling Unix functions.
Theoretically this should get us much closer to being usable on non-
Unix platforms.
* Support alternate syntax for configuration, using DefineAuthExternal and
DefineAuthGroup commands.
* More detailed error logging.
* Much cleanup of documentation.
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