[chirp_devel] I'd like to add some features to the developer tools

[chirp.cordless at xoxy.net]

Now that a build is available incorporating the changes I submitted
in April, so I don't feel like I'm trying to hit a moving target, my
intention is to move forward with the FT-60 feature settings
memory map project I started on several months ago.

I have some extensions to the developer's tools I've added to make
that easier for me, and I expect probably at least some would be
useful to others. I've been hacking them in to whatever source base
I'm working with, and was about to again, but I think it's time to see
if I can just get them into the main codebase once and for all.

Pretty much ready to go, and stable for several months. But I
don't want to open a bug if this will be received negatively.
In almost all cases, default behavior is unchanged, and where it's
not, the differences are trivial and benign. Here's the feature list:

====================
Changed the title of the hex dump window from "Differences" to
a string similar to the one printed to debug.log, showing the
two file names and memory numbers. Cleaned up an unmatched
trailing ')' in that print in the process of making this change.

Added a feature to display _only_ different lines in the hex dump,
controlled by setting the first memory # to -2.

Added some help text to the "Diff Radios" dialog explaining the
hex dumps available with mem # = -1 and -2.

Added user control of the font size for both the hex dump and the
Browser (separately). Controlled by new chirp.config integer properties
diff_fontsize and browser_fontsize in new [developer] section.
Defaults are unchanged at 11 and 10, respectively.

Added hexdump_addrfmt string property to the [developer] section
accepting values of hex, decimal, and both. The default remains decimal.

Added diff_charflag boolean property to the [developer] section.
When True, an additional line is printed after each pair of -/+
diff lines, with a '^' in each character position, other than the first,
where the lines are different, blank otherwise. Default is False.

Added hexdump_linesize integer property to the [developer] section
accepting values of 8 and 16. The default remains 8.

Added an extra " " between every group of 4 bytes in the hex dump.
====================
The source changes aren't extensive, but they're spread over 4 files:
common.py
mainapp.py
radiobrowser.py
util.py

Shall I move forward with this?

-dan