Remove regtest actions, introduce build-all actions:
- regtest was not easy to use
- one may wish to simply build all samples
- introduce a per-sample automatic build

/trunk/docs/overview.txt | 19 14 5 0 ++++++++---
/trunk/samples/samples.mk | 92 49 43 0 ++++++++++++++++++++++++++++-------------------------
/trunk/ct-ng.comp | 8 5 3 0 +++--
3 files changed, 68 insertions(+), 51 deletions(-)

 # x86_64 specific options

 config ARCH_x86_64

     select ARCH_SUPPORT_ARCH

     select ARCH_SUPPORT_CPU

     select ARCH_SUPPORT_TUNE

     help

       The x86_64 architecture, as defined by:

         http://www.amd.com/us-en/Processors/DevelopWithAMD/0,,30_2252_875_7044,00.html