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The idea here, is that you do not simply set a target operating system
or architecture, but have a setting for all things different between the
operating systems. Knowledge about the name and habits of the operating
system is left to the frontend.
(We may want to provide a small support library in the future to share
the triple parsing and OS -> settings code between multiple frontends).

In their current state they produce very bad code and are just a
maintenance burden.

It has been empty for nearly all systems. People who used to put stuff
in config.h can still create a config.h on their own and inject
-include (gcc) or /FI (msvc) into their CPPFLAGS.

This especially removes unused complicated error reporting mechanisms

Just state the copyright and the project the files belong to. You can
then find the COPYING file for the whole project.

Remove the stabs debugoutput code and with it all the complexity of a
modular debug output system. The only remaining debug output module is
dwarf.

Always make pbqp coloring available

[r28127]

[r28010]

becopypbqp.c and becopypbqp.h removed!

[r27771]