hdf5_ep

[svn-r19020] Enhancements:
Cleaned up the code a bit by:
1. It used to that -xxx options must be at the beginning such that
   "buildhdf5 --disable-shared -config" was an error. Now -xxx options
   can appear anywhere in the command options.
2. Eliminate the need of variables $CONFIG_CXX, $CONFIG_FORTRAN,
   $CONFIG_PARALLEL by appending their values to $CONFIG_OP directly.
3. Also append $WITH_SZLIB to $CONFIG_OP when it is defined, not later.
4. Call CONFIG directly instead of setting up $CONFIGURE.
5. Removed the last TIMESTAMP since "trap 0" will call QUIT which calls
   TIMESTAMP already. This eliminated the extra timestamp when it finishes
   normal.

tested:
Tested by hand since h5committest does not really test this command.