Added possessive modifiers ++ *+ ?+ {}+.

Added support for \v and \h as character classes as per Perl-5.10. 

[SVN r52558]

doc/html/boost_regex/ref/posix.html

@@ -3,7 +3,7 @@
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+<meta name="generator" content="DocBook XSL Stylesheets V1.74.0">
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@@ -165,7 +165,7 @@
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@@ -379,7 +379,7 @@
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@@ -467,7 +467,7 @@
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@@ -537,7 +537,7 @@
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