Fix plugin urls

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Many of the plugins force the use of /mod/<plugin_name>/everyone.php because of the restrictions on the urls. I think I can create backwards compatible page handlers that fixes this problem.

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(In [svn:7242]) Refs #2630 - fixed 1.7 blog urls

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(In [svn:7243]) Refs #2630 - fixed 1.7 bookmarks urls

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(In [svn:7244]) Refs #2630 - fixed 1.7 members urls

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(In [svn:7245]) Refs #2630 - updated 1.7 pages urls

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(In [svn:7246]) Fixes #2564 Refs #2630 1.7's thewire plugin has better urls and links to users

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(In [svn:7254]) Refs #2630 - groups plugin in 1.7 uses page handler for all URLs

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(In [svn:7255]) Refs #2630 invite friends plugin in 1.7 branch now uses page handler

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(In [svn:7256]) Refs #2630 messages 1.7 plugin uses page handler urls now

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(In [svn:7262]) Fixes #2630 updated 1.7 file urls

[iionly]

The url change in the message plugin from pg/messages/username to pg/messages/inbox/username is missing backward compatibility. I've only found the vazco_topbar plugin relying on on the old link so far.

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(In [svn:7458]) Refs #2630 supporting pg/messages/<username>

[iionly]

Elgg 1.7.5: in mod/messages/actions/delete.php line 61 is a forward to mod/messages/inbox/ instead of pg/messages/inbox/ resulting in a 404 error after deleting messages.

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(In [svn:7483]) Refs #2630 fixed url in messages delete action