Merge remote branch 'htools/master'

* htools/master: (605 commits)
  Update NEWS file for version 0.3.1
  Update copyright years in the man pages
  Remove obsolete env vars from the manpages
  Fix dist archive generation
  luxi backend: show attribute names in errors
  Update exit code information in the hbal man page
  Fix broken hscolour.css symlink in tarball
  Update NEWS file for the 0.3.0 release
  Remove an obsolete TODO
  Update live-test.sh w.r.t. simulation mode changes
  Prevent allocation on unallocable node groups
  Fix bug in simulation backend
  Precompute allocation nodes
  Change the AllocNodes type and functions
  Extract node pair generation from tryAlloc
  tryAlloc: restrict valid node pairs to same-group
  Cluster.hs: add a new type alias
  Rapi: read and use the vm_capable node flag
  IAllocator: read and use the vm_capable node flag
  IAllocator: replace fake policy with real one
  ...

Note: done via the following sequence of commands:

  git checkout master && git pull
  git remote add htools git://git.ganeti.org/htools.git


  git remote update
  git merge -s recursive -X subtree=htools htools/master

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: René Nussbaumer <rn@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>