vchoi_fork

[svn-r22836] Purpose: Fix bug HDFFV-533 and add other missing functions
Description:
    In this bug, H5File doesn't have the ability to create attribute.  The
    following changes will provide that functionality and several others that
    were also missing:
    - Added an abstract class H5Location in between IdComponent and H5Object.
    - New class structure of IdComponent, H5Location, H5Object, H5File
                                IdComponent
                                     |
                                H5Location
                                /        \
                        H5Object        H5File
    - Wrappers in H5Object were moved to H5Location because the related C
      functions take either file, group, dataset, or named datatype ID.
    - Added wrapper for H5Rget_obj_type2
    - Added tests for file attributes and H5Rget_obj_type2 wrapper
Platforms tested:
    Linux/32 2.6 (jam)
    Linux/64 2.6 (koala)
    SunOS 5.10 (linew)