quicktabs 7.x-3.0-beta1

#1192538: Several nonexistent php files being pointed to.
#1200014: Notice : -> Undefined variable: tab in QuickViewContent.inc
#1201902: Notice: Undefined property: stdClass::$machine_name
#1188810: Label overlaps select box
#1188592: Add an options mechanism for renderers
Also:
Added a menu callback content plugin so that you can choose any drupal path as the content of a tab, with support for %-style args in the path
Serious WTF: only call drupal_alter when a QT is being built, not when loaded, otherwise the admin form does not necessarily display what's in the db
API change: options_form method for content plugins is now optionsForm, to be consistent with method naming
Added the note about node privacy settings (same as in D6 version) to the README file