Add fieldset tabs configuration based on content type

Change the configuration following the same behavior than vertical tabs, now the configuration is on each content type form and allows to activate basic tabs with residual fieldgroup by content type.

This way is possible to have content types that are shown as standard nodes with a fieldgroups in bottom tabs or all the node in tabs with a custom default tab name.

There is also a patch to cck_fieldgroup_tabs.install that allows to uninstall the module cleaning any variable, and add an update to clean up any existing Basics configuration resetting them to '', so remember to activate again the content types with CCK Fieldgroup Tabs, that you had set as Basics, adding a title to the residuals Basics Tabs. Any non Basics named tab is left with existing settings.

Patch and run update.

BTW, wording probably needs a check!

This patch has been tested with last submited ones:
- fixed for description and help text in tabs: #559850: Fieldgroup help text and description are not shown in tabs with cck fieldgroup tabs style
- horing weights for core fields when showing a residual tab: #559850: Fieldgroup help text and description are not shown in tabs with cck fieldgroup tabs style