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.

 # Build a list of all available samples

 CT_SAMPLES = $(patsubst $(CT_TOP_DIR)/samples/%/crosstool.config,%,$(filter-out %Makefile,$(wildcard $(CT_TOP_DIR)/samples/*/crosstool.config)))

 .PHONY: $(SAMPLES)

 $(CT_SAMPLES):

 	@cp "$(CT_TOP_DIR)/samples/$(@)/crosstool.config" "$(CT_TOP_DIR)/.config"

 	@$(MAKE) oldconfig

 help::

 	@echo  'Preconfigured targets:'

 	@$(CT_TOP_DIR)/scripts/showSamples.sh $(CT_SAMPLES)

 	@echo  ''

 saveconfig:

 	@$(CT_TOP_DIR)/scripts/saveSample.sh