This patch does some small changes:
  - fixes a comment
  - export more node functions (unneeded now, but hscan will use them)
  - fixes Makefile rule for building the programs

The modules are moved from the ‘top’ namespace to ‘Ganeti.HTools’, in
compliance with standard practices.

This patch attempts to embed the VCS id in binaries, based on the way
other projects seem to do this.

This fixes the doc issue which exists since the addition of hbal. Now
make doc makes sense again.

This is the initial import of release 0.0.3.