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Tools that don't use standard_kconfig() currently generate spammy
tracebacks for e.g. syntax errors.
Add a suppress_traceback flag to Kconfig.__init__() for catching
"expected" exceptions and printing them to stderr and exiting with
status 1. Use it to make all tools consistently hide tracebacks.
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Hardcoding load_config() and write_(min_)config() to write any message
to stdout is awkward, because it means that the message can't be easily
reused when stdout is the wrong place to write it to (e.g. in
menuconfig/guiconfig). This gets extra bad now that there's also the "No
change to ..." message.
Modify load_config() and write_(min_)config() to return the message as a
string instead, and have them always return a message, instead of just
when 'filename' is None and verbose=True. This makes things flexible and
straightforward.
Use the new behavior in menuconfig.py and guiconfig.py. They now show
"No change to ..." when saving a file doesn't modify it.
Tools that want to write messages to stdout should now do
print(kconf.load_config()) / print(kconf.write_config()).
There's no clean way to preserve perfect backwards compatibility here,
but keep accepting the 'verbose' argument and print a deprecation
warning if a value is ever passed for it. That way, scripts will keep
running, though possibly with less output on stdout.
This changes the meaning of the load_config() return value as well,
though I suspect it was only ever used by the menuconfig/guiconfig
interfaces.
The new behavior applies for kconfiglib.VERSION >= (12, 0, 0).
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Small help text improvement.
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This makes running pydoc(3) on the utilities helpful.
Reuse the module docstring for the --help text for utilities that use
argparse.
Also fix some copy-paste errors in the all*config.py descriptions and
clean up the language a bit.
Piggyback removal of an optimization in allmodconfig.py that's pretty
irrelevant now.
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Minimal configuration files can already be generated from within the
menuconfig too, but having a script available can be handy for
scripting.
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