Move Cocoa release pool to main

.. because mainwindows come and go and we need to persist
   across them all.
Add Fedora 18/19 x86_64 RPMs for downloading
Fixup Stack By Series

Finish off the nits and missing pieces for the recent
update to enable plotting in a stack by data series;

* Now plots W' bal, LR Balance and headwind
* Stacks are now redrawn when settings change
* Interval marking is fixed
* Baseline is now set correctly for each plot
* Reference lines are plotted (on power plots only)
* Reference lines can be dragged
* Interval markers are not redrawn with the text
  only shown on first plot
Fixup Stack View Zooming

.. it was a bit shit with controls you couldn't
   use, and when you did nothing happened.

.. now has a slider and 7 distinct settings for
   stacks from ok to large and 5-60 mins sections.

.. should be good enough for most users.
Merge remote-tracking branch 'upstream/master'