Re-Introduce "$ENV{HDF5_ROOT}" in CMAKE_PREFIX

- adding HDF5_ROOT to CMAKE_PREFIX allows to PREFER the installation in
  HDF5_ROOT over system installations
Remove LINK_DIRECTORIES for PACKAGES (HDF5)

- in FIND_PACKAGES, INCLUDE_DIRECTORIES returns absolute paths
  by default and LINK_DIRECTORIES should not be used
  http://cmake.org/cmake/help/v2.8.11/cmake.html#command:link_directories
Merge pull request #25 from ax3l/topic/prefix

Re-Introduce "$ENV{HDF5_ROOT}" in CMAKE_PREFIX
Add support for VampirTrace builds
Merge branch 'master' of github.com:ComputationalRadiationPhysics/libSplash
Fix getEntriesForID for deep-groups
Update VAMPIR_ENABLE option in cmake
Merge pull request #26 from ComputationalRadiationPhysics/fix_entries

Update VAMPIR_ENABLE option in cmake
Fix cmake files
Merge pull request #27 from ComputationalRadiationPhysics/fix_cmake

Fix cmake files
Add rank to Domain
Added rank for domains
Make PDomainC write domain rank
Merge pull request #28 from ComputationalRadiationPhysics/add_rank

Add rank to domains
Fix cmake files
Merge branch 'add_rank'

Conflicts:
	CMakeLists.txt
	tests/CMakeLists.txt