Make the progress bar a default for all samples.

Always call distclean after each sample when doing a regtest.

Update version to -svn.

Prepare to release crosstool-ng-0.0.5.

Rework the help system. For now, this is mostly a no-op (it only re-organise the help entries), but later, that may come in handy when we want ct-ng to be installable).

Offer an option to build the gdbserver statically. This helps in case of debugging shared library loading.

The log file is no longer configurable: it is always "${CT_PREFIX_DIR}/build.log".
Add an option to compress the log file upon successfull build.
Make rendering the toolchain read-only optional.
A few eye-candy fixes.

Default the progress bar to 'Y'.

Bail out if .config is missing.

Speak of regtest in "make help".

Update version to -svn.

Prepare to release crosstool-ng-0.0.4.

scripts/showSamples.sh:
- revert sample dumping to not show the components versions;

docs/overview.txt:
- reorder docs/overview.txt so that configuring comes before running,
- tell about regtest;

Makefile:
config/global.in:
- point to docs/overview.txt for the list of steps;

Add intermediate mesages when building regtests.
Distclean the repository after each sample during regtests.

Add the "regtest" make target: call "make regtest", and all samples wil be built, and a tarball made for each of them. First sample to fail causes the test to stop.