[FIX] mail: Set the return path on the Zend_Mail sendmail transport (as a parameter in the constructor using the site's sender_email pref).

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48328 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] warnings: Check callbacks are callable in a couple of places (as advised by my favourite IDE)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48329 b456876b-0849-0410-b77d-98878d47e9d5
[ENH] Display the admin wizard toolbar both above and below the wizard page.
Having the toolbar below follows the "read flow". Having it above make scrolling pages easier, since buttons remain in the same position.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48330 b456876b-0849-0410-b77d-98878d47e9d5
[MOD] wizard: Make the "Open Admin Wizard" link on admin pages more discreet to reduce screen clutter (just the icon button with a tooltip)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48331 b456876b-0849-0410-b77d-98878d47e9d5
[ENH] Look and feel should be earlier in the process. Language should come before look and feel. Thanks xavi and jonnyb

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48332 b456876b-0849-0410-b77d-98878d47e9d5