make package paths conform to opam overlay convention

Conflicts:
	src/o2wPackage.ml
Edit link
Fix package descriptions

Don't nest <p>, don't convert header short_descr into HTML from md
Move OPAM site specific title content into template
Fix O2wPackage.href base bug
Fix O2wStatistics.internal_regexp
Make package metadata Edit link less fragile
CHANGES
unhack the edit link
Merge pull request #76 from dsheets/master

Very good, thanks !