vchoi_fork

*  I added Doxygen header for H5Tinsert. Verification and cleanup work is needed.
* revert incorrect change
* Updated TODO items.
* Correct output for C style
* Moved H5Pcreate, H5Pclose from H5P.c to H5Ppublic.h
*  Doxygen: Added H5Pset_chunk, H5Pget_chunk
* Minor touch-up.
* Added sub-modules for H5P.
* Sub-modules for datatypes.
* Moved current H5T functions to the right submodule.
* Move the current H5T RM blocks into the header.
* Moved current H5L RM block from source to H5Lpublic.h.
* Fixed the \since commands.
* Doxygen: Added H5Pset_layout
* A first stab at predefined datatypes.
* A few more H5D pieces.
* Add/change H5Pclose, H5Pget_filter1&2,H5Pget_nfilters, H5Pset_deflate
* A few more H5L functions.
* Doxygen: Added H5Pset_szip
* Cosmetic changes.
* Doxygen: Added H5Pget_layout
* A few more H5L functions and simplified main page.
* A few more predefined types.
* A couple more H5L functions.
* remove doxygen commands and restore old header
* H5Lexists now exists in the new RM.
* move doxygen code to public header
* H5Lget_info2 plus some housekeeping.
* A few more H5L functions.
* Maybe this should be mentioned upfront.
* moved dox commands from H5Sselect.c to H5Spublic.h
* moved dox commands from H5Sselect.c to H5Spublic.h
* Add H5Sselect_shape_same, intersect_block, elements, all, none
* Fixed H5Lget_info_by_idx2.
* Moved RM blocks into header files.
* Changed H5Gcreate* and H5Gopen* to H5Gcreate() and H5Gopen()
* Fixed typo
* Adding intermediate APIs