#446396: When "From Panel" arguments were not present, view titles were being constructed incorrectly.

Backport of D6 fix to the save function; the $panel_page->current pointer is now properly updated to point to the exported-and-now-current display once the save operation is completed.

#349724: Reverted earlier commit on {panels_page}.access delimiter format, and sticking with the earlier one. The underlying issue is still fixed.

Regression: default panel displays being lost due to "primary" display check neglecting to notice it being there and trying to load an invalid did.

#333456 by mooffie: Corrected sample code in panels_panels_include_directory() docblock to use plural plugin type names.

Updated general panels_page settings form validation to prevent errors resulting from names consisting only of numbers.

#247695 by sdboyer, chaps2: Fix to ensure that display/pane exports have all relevant configuration data. Also added an informational-only update function encouraging site admins to re-export any previously exported Panels, as the exports were potentially affected by this problem.

* Updated German translation (60% complete)
* Requires patch in #293461

Tweaked pane rendering to skip creating a title if no title was returned by the pane render callback. (Backported from 6)

The reasons for its removal are...unclear. I'm commenting it out for now, but am continuing to investigate the changes around that time, as I can't remember my line of thinking for removing it.