Fixed DomainCollector search strategy

 - fixed DomainCollector to stop searching if Domain can't be found
Improved FileAccessTest

 - improved file access test to check that FAT_CREATE destroys old file
Fixed domain read strategy

 - fixed domain reading strategy for FAT_READ
 - added domain FAT_READ test in DomainsTest
Started ParallelDataCollector

 - added interface and class for parallel data collector
 - added simple parallel test
 - only writing supported right now
 - MPI is currently mandatory for building
 - updated HandleMgr to work with different naming schemes
 - added callbacks to HandleMgr
 - updated .gitignore
Several fixes to PDC and parallel testcase

 - fixed indexFromPos in PDC
 - fixed usage of H5Lexists (cannot be called collectively)
 - improved parallel test to check multiple mpi/grid sizes
 - improved HandleMgr callback functions
 - added Options in PDC
 - PDC writes file header for compatibility with SDC
 - PDC must explicitly create fileAccessProperties
Added documentation and fixed privacy
Enabled attributes in PDC

 - enabled support for global and local attributes in PDC
 - added Parallel_AttributesTest
 - fixed some exception msgs in SDC
Added read support to PDC

 - PDC supports reading data
 - added new read methods to IParallelDataCollector interface
 - enhanced Parallel_SimpleDataTest to use multiple reading methods
Support remove to PDC

 - PDC now supports to remove groups and datasets
 - added parallel remove test
Support getEntryIDs in PDC
Fixes to references

 - fixed createReference in DCDataSet
 - PDC does not support region references
 - added checkExistence flag in DCDataSet
 - removed type attribute from createReference interface
Fixed References support

 - SDC and PDC support object references (DataCollector interface)
 - PDC does not support region references
 - added tests for object refs (read missing)
Improved documentation
Improved PDC write size/offset detection

 - PDC automatically detects globalSize/Offset at write if not given
 - improved CMakeLists.txt (added PARALLEL option)
Improved doc for IParallelDataCollector
Removed old commented code
Improved tests and documentation

 - improved install documentation
 - added/improved test scripts
Note on not supported functions
Added missing GPL snippet
Beautifying doc