Andrew Burgess 7421ccda76 gdb/tui: add a tui debugging flag
This commit adds 'set debug tui on|off' and 'show debug tui'.  This
commit adds the control variable, and the printing macros in
tui/tui.h.  I've then added some uses of these in tui.c and
tui-layout.c.

To help produce more useful debug output in tui-layout.c, I've added
some helper member functions in the class tui_layout_split, and also
moved the size_info struct out of tui_layout_split::apply into the
tui_layout_split class.

If tui debug is not turned on, then there should be no user visible
changes after this commit.

One thing to note is that, due to the way that the tui terminal is
often cleared, the only way I've found this useful is when I do:

  (gdb) tui enable
  (gdb) set logging file /path/to/file
  (gdb) set logging debugredirect on
  (gdb) set logging enable on

Additionally, gdb has some quirks when it comes to setting up logging
redirect and switching interpreters.  Thus, the above only really
works if the logging is enabled after the tui is enabled, and disabled
again before the tui is disabled.

Enabling logging and switching interpreters can cause undefined
results, including crashes.  This is an existing bug in gdb[1], and
has nothing directly to do with tui debug, but it is worth mentioning
here I think.

[1] https://sourceware.org/bugzilla/show_bug.cgi?id=28948
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		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
debuggers, etc., plus their support routines, definitions, and documentation.

If you are receiving this as part of a GDB release, see the file gdb/README.
If with a binutils release, see binutils/README;  if with a libg++ release,
see libg++/README, etc.  That'll give you info about this
package -- supported targets, how to use it, how to report bugs, etc.

It is now possible to automatically configure and build a variety of
tools with one command.  To build all of the tools contained herein,
run the ``configure'' script here, e.g.:

	./configure 
	make

To install them (by default in /usr/local/bin, /usr/local/lib, etc),
then do:
	make install

(If the configure script can't determine your type of computer, give it
the name as an argument, for instance ``./configure sun4''.  You can
use the script ``config.sub'' to test whether a name is recognized; if
it is, config.sub translates it to a triplet specifying CPU, vendor,
and OS.)

If you have more than one compiler on your system, it is often best to
explicitly set CC in the environment before running configure, and to
also set CC when running make.  For example (assuming sh/bash/ksh):

	CC=gcc ./configure
	make

A similar example using csh:

	setenv CC gcc
	./configure
	make

Much of the code and documentation enclosed is copyright by
the Free Software Foundation, Inc.  See the file COPYING or
COPYING.LIB in the various directories, for a description of the
GNU General Public License terms under which you can copy the files.

REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info
on where and how to report problems.
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