Releases for Panels Tabs

Last release seems to be missing these two fixes - trying again

#889294: Links not properly updated when switching tabs
#896998: Add support for Calendar Views within Panel tabs

#873362 Fix to missing argument error on older versions of panels
#620304 Tabs panel can now provide title for panel

o #865922 by smoothify: Update to work fully with panels 3.7(2)

Fixes the issue with the current panels/ctools version.

* Fix plugin for panels > 3.3

Changes since DRUPAL-5--1-5:

• Slight clarification in the README.
• #208832: Hide empty tabs
• Fixed #296373: Fragment checking

Changes since DRUPAL-5--1-4:

• Cope with changes in the latest versions of Panels and jstools/tabs.
• Implemented #270509: Paged views don't have the tab fragment set

- Cleaner code.
- Ready for Panels 2 beta 1. This time the API won't change anymore, so this release will probably stick around for a long time.
- New feature: horizontally filling, smart width tabs: calculates the length of the text in each tab and compares this to the total length of the text on all tabs. It then sets the width property of each tab according to the percentage of text the tab contains. Replaces horizontally filling equal width scaling tabs, which didn't work all that good.

This release is compatible with Panels 2 alpha 11. I'm tagging a release, because the API probably won't change anymore.