Debug facilities:
- add a framework to easily add new ones
- add gdb as a first debug facility
- add patches for gdb
After the kernel checked its installed headers, clean up the mess of .checked.* files.
Reorder scripts/crosstool.sh:
- dump the configuration early
- renice early
- get info about build system early, when setting up the environment
- when in cross or native, the host tools are those of the build system, and only in this case
- elapsed time calculations moved to scripts/functions
Remove handling of the color: it's gone once and for all.
Update tools/addToolVersion.sh:
- handle debug facilities
- commonalise some code
- remove dead tools (cygwin, tcc)
Point to my address for bug reports.

 #!/bin/sh

 # This scripts extracts a crosstool-ng configuration from the log file

 # of a toolchain build with crosstool-ng.

 # Usage: $0 <logfile>

 cat "$1" |awk '

 BEGIN {

   dump = 0;

 }

 $0~/Dumping crosstool-NG configuration: done in.+s$/ {

   dump = 0;

 }

 dump == 1 { $1 = "" }

 dump == 1

 $0~/Dumping crosstool-NG configuration$/ {

   dump = 1;

 }

 ' |cut -d ' ' -f 2-