Description:
    Begin process of migrating from using property list IDs internally to the
library to using the internal generic property list data structure.

Tested on:
    Mac OSX/64 10.9.2 (amazon) w/C++, FORTRAN & parallel
    (h5committest forthcoming)


git-svn-id: https://svn.hdfgroup.uiuc.edu/hdf5/trunk@25084 dab4d1a6-ed17-0410-a064-d1ae371a2980