Added check for store NDAttributes flag to ensure NDAttributes are only stored if requested.
Refactored store_onClose_attributes and store_onOpen_attributes as they used very similar code.  Both methods reduced and common method created.
In verifyLayoutXMLFile method reusing the fileExists method instead of duplicating the code.
Removed the cast of long long* to int* and ensure the int value is truncated before assigning in the createNewFile method.
Added a free(hdfAttrNode) call to closeAttributeDataset method to stop a memory leak.
Fixed memory leak of datavalue in the store_onOpenClose_attribute method.
Removed all references to HDF5 in NDFileHDF5Layout except for the filenames and the namespace.  It is now easy to change the fully qualified name by simply changing the namespace.
Moved the Attribute _copy method into the cpp file.
Fixed memory leak in new_dset method.
Added check for ptr_tree in destructor of LayoutXML class.
Cleaned up the method verify_xml.
Cleaned up the unload_xml method.
Reformat files.
Reformat files.
Reformat files.
Updated methods and private data to use camelCase.
Merge pull request #16 from ajgdls/dls_code_review

DLS code review tweaks and changes. Thanks Alan!