[chirp_users] New Daily Build

[Build System]

Greetings,

A new daily build of CHIRP is available.  This includes changes made
directly to the tree yesterday, and may include additional features,
bug fixes, and/or bugs.  If you are interested in trying it, grab it
from the following location:

  http://trac.chirp.danplanet.com/chirp_daily/daily-20160531


A list of the changes included in this build (since the last daily)
follows:

Changes for Build #405
[Tom Hayward <tom at tomh.us>] [ui] Change clipboard target to support cross-process copy/paste on Windows. #3693

Clipboard target was PRIMARY, the X clipboard. Changed to CLIPBOARD, the
default clipboard, for better Windows support including the ability
to copy/paste between multiple instances of Chirp.

http://intrepid.danplanet.com/pipermail/chirp_devel/2016-May/004018.html

[Tom Hayward <tom at tomh.us>] [ui] Store clipboard outside of app, so paste works after quitting. #3691

[Tom Hayward <tom at tomh.us>] [ui] Deprecate .chirp file format by disabling export. #3689

The .chirp file format provides no additional features compared to .CSV and is
therefore redundant. .chirp is the more complex and less frequently used format
of the two, so to eliminate the redundancy it should be deprecated.

This patch removes the ability to export as .chirp, leaving no way to generate
new .chirp files. It preserves the ability to open and import .chirp files, so
any existing .chirp files can still be opened, edited, and exported to other
formats.