Simplify PMID regex

git-svn-id: svn://svn.code.sf.net/p/autowikibrowser/code/AWB@9420 5227b50d-9349-4574-b055-4b0a7525e11c
Tidy up italic html tag logic

git-svn-id: svn://svn.code.sf.net/p/autowikibrowser/code/AWB@9421 5227b50d-9349-4574-b055-4b0a7525e11c