Log Message:
Note: Psi 0.15 uses a new profile data format. Data from 0.14 and
prior will be migrated to the new format when you run 0.15 for the
first time.

Changes:
  - Merge many changes from Psi+.
  - New message history browser.
  - New, fast contact list window.
  - TURN proxying for voice calls.
  - Store data in more standardized locations based on the platform.
  - No longer dependent on the Qt3Support library.
  - Domains ending in .local now always work, whether via DNS server or mdns.
  - Windows 64-bit and Mac 64-bit now supported. Mac PPC deprecated.
  - Legacy SSL port probe feature removed.
  - Various small features and bugfixes.

Since 0.14, this version contains about two years worth of merges
from the Psi+ project. Thanks to Rion and Dealer_WeARE for diligently
keeping the Psi source repo current all this time.