Fix empty-matching possessive zero-repeat groups bug.


git-svn-id: svn://vcs.exim.org/pcre/code/trunk@1478 2f5784b3-3f2a-0410-8824-cb99058d5e15
Another test case for previously fixed bug.


git-svn-id: svn://vcs.exim.org/pcre/code/trunk@1479 2f5784b3-3f2a-0410-8824-cb99058d5e15
Fix auto-possessification bug.


git-svn-id: svn://vcs.exim.org/pcre/code/trunk@1480 2f5784b3-3f2a-0410-8824-cb99058d5e15
Give error for \x{} and \o{}.


git-svn-id: svn://vcs.exim.org/pcre/code/trunk@1481 2f5784b3-3f2a-0410-8824-cb99058d5e15