[MOD] prefs: Make feature_wiki_paragraph_formatting default to 'y' so wysiwyg can be enabled without "advanced" admin (and it's better generally!)
Includes installer script to keep previous value.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@46939 b456876b-0849-0410-b77d-98878d47e9d5