Separated out the generation of the page name for form action into a separate function to make it easier to change.   For example when using MRBS in a subdomain the full page name is required to ensure that POST data gets through.

git-svn-id: http://svn.code.sf.net/p/mrbs/code/mrbs/trunk@2863 25f7e783-145e-4f2d-a9f8-dd7182bfe9c7