removing pxnCommon external link

git-svn-id: http://webookplus.googlecode.com/svn/trunk@8 e4af1bdb-a942-0fa5-43bf-c3b0ff943415
added plugin.yml
copied some code into WeBookPlus class from WebAuctionPlus
added dbUpgrade and wbSettings empty classes

git-svn-id: http://webookplus.googlecode.com/svn/trunk@9 e4af1bdb-a942-0fa5-43bf-c3b0ff943415