Add new parallel test for zero accesses

 - tests reading/writing with size=0
Add new parallel test for zero accesses

 - tests reading/writing with size=0
Rebased against dev branch (trigger test)
Merge branch 'zero-access' of github.com:ComputationalRadiationPhysics/libSplash into zero-access

Conflicts:
	tests/Parallel_ZeroAccessTest.cpp
Merge pull request #83 from ComputationalRadiationPhysics/zero-access

Add new parallel test for zero accesses
Enhance ZeroAccess test to test read-after-end
Improve logging and zero-access test

 - logging prints MPI rank
 - za-test prints values and tests for offsets beyond size
Merge pull request #90 from ComputationalRadiationPhysics/za-after-end

Zero-access after end, logging
Allow zero-size domains with invalid offsets

 - allows to read zero domains with from out-of-bounds offsets
   to ensure that all processes participate in collective requests
Update documentation and manual
Add domain_write_mpi example and fix cmake
Add comments to example
Update comment style
Merge pull request #91 from ComputationalRadiationPhysics/example-domain-write

Add domain_write_mpi example and fix cmake
Allow zero-size domains with invalid offsets

 - allows to read zero domains with from out-of-bounds offsets
   to ensure that all processes participate in collective requests
Merge branch 'za-after-end' of github.com:ComputationalRadiationPhysics/libSplash into za-after-end
Merge pull request #92 from ComputationalRadiationPhysics/za-after-end

Zero domain access after end of data
Add details on hdf5 structure to user manual
Add changelog and update version number
Document OpenMPI 1.5.1+ Requirement