Remove the incomplete i686-unknown-linux-uclibc sample.

Update the i586-geode-linux-uclibc sample.

Don't make checking the kernel config file a step by itself. Only make it a step if we need a not-provided kernel config file.

Bah, the arm-qemu-linux-uclibc sample isn't usefull. Base your work on the armeb-unkown-linux-uclibc sample instead.

Update the mips-unknown-linux-uclibc sample:
- LFS is needed to properly compile libstdc++ (pity),
- globally update to the latest set of options.

Update armeb-unknown-linux-uclibc sample:
- no need for the kernel .config file,
- globqlly update to latest set of options.

Simplify kernel config file need.
Don't build a default config file when not needed.

Don't print directories as we descend into them.

Fix glibc and uClibc downloading and extracting.
Although we no longer need the kernel config file, we now need to specify the kernel source directory when installing headers.
Re-order components downloading to match build order.
Fix the saveSample.sh script in case the referenced files are the same as the destination files.

Merge the save-sample branch to trunk:
- reorder most of the environment setup,
- geting, extracting and patching are now components' sub-actions,
- save the current config as a sample to be used as a pre-configured target.