[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-20161220


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

Changes for Build #455
[Jim Unroe <rock.unroe at gmail.com>] [RT1] Add Support for Retevis RT1(fix for build failures)

This patch addresses the build failures of the previously submitted patch.

#4313

[Jim Unroe <rock.unroe at gmail.com>] PEP8 cleanup for Alinco driver

This patch resolves the issues that are causing the Alinco driver
to be flagged as needing a bit of PEP8 cleanup.

#4315

[Jim Unroe <rock.unroe at gmail.com>] [NC-630A] Driver Cleanup

This cleans up some pep8 errors that I must have missed when testing.
There are otherwise no changes to the driver.

Related to #4235

[Jim Unroe <rock.unroe at gmail.com>] [RT1] Add Support for Retevis RT1

This patch adds CHIRP support for programming both the
VHF and UHF models of the Retevis RT1 handheld radios.

#4313

[Jim Unroe <rock.unroe at gmail.com>] [RT21] Add PF1 Function Key Setting

This patch adds the ability to set the PF1 key function of the Retevis RT21.

#4139

[Jim Unroe <rock.unroe at gmail.com>] [RT22] Add Support for Luiton LT-316

This patch adds support for the Luiton LT-316 variant to the
retevis_rt22.py driver.

Related to #4145

[Jim Unroe <rock.unroe at gmail.com>] [RT22] Add Retries When Initializing Cloning

Cloning does not always begin on the initial request. This patch
adds the ability to retry up to five times (similar to how the
factory software does it).

Related to #4145