Fix POD formatting

Hi,

This short pull requests fixes the hyperlink POD for the two links in "CGI.pm HAS BEEN REMOVED FROM THE PERL CORE", they were not rendering properly, also moves the section about raising bugs and the old and new bug tracker from the LICENSE section to the BUGS section.

Thank you
Merge pull request #145 from MartinMcGrath/patch-1

Fix POD formatting