add posix classes of the form [:xxx:]
add ounit based test for pcre posix classes
regenerate oasis
add ounit to merlin
add complement ^ support for pcre posix classes

eg. [:^blank:]
pcre - improve flag handling and add Re_pcre.re

* Re_pcre.re is useful to get uncompiled form
* Add multiline and anchored flags since they seem to be supported
* explictly define the types of flags we have
add substrings = Re.substrings synonym
initial re_pcre mli
rewrite Str.quote not to warn on 4.02

use Buffer.t for a buffer instead of a mutable string
changed ?anchored:unit to ?anchored:bool
Merge pull request #31 from rgrinberg/glob_anchored_tweak

changed ?anchored:unit to ?anchored:bool
Merge pull request #30 from rgrinberg/str_quote_rewrite

rewrite Str.quote not to warn on 4.02
Merge pull request #29 from rgrinberg/re_pcre_improve

Re_pcre improvements
Merge pull request #28 from rgrinberg/pcre_posix_classes

posix character classes for pcre