fixes malformed link when developer is viewing their own plugin
registers metadata names for tag search
renamed widget view to content to remove deprecation notice.
Fixes get_user_object deprecation notice
remove old code
fixes "most recommended" calculation on plugin landing page
Fixes issue where PluginProject::getReleaseFromVersion() would redirect to the wrong plugin page due to a NULL guid
fixes incorrect ordering based on downloads
Updated manifest to 1.8 format
Merge pull request #4 from beck24/master

1.8 polishing
Removes classes which have been subsumed into Elgg 1.8
Refactors diggs code slightly to be more OO
Removes back to plugins link
Alphabetized js/css registration
Removes run_once functions
Uses more standard Elgg markup for plugin settings area
Removing subtypes on plugin deactivate
Implements much nicer profiles for plugins
Removes unused css
Updates use of deprecated list_entities* functions