h4map

Description:
    Added:
	hmap_read_nonspecial.c: tests reading regular SDS data without SD API
	hmap_read_chk.c: tests reading chunked SDS data without SD API
    Clean up the others.

Tested Platforms:
    No automatic build yet.  Built and checked data manually on these:
    Linux/32 2.6 (jam)
    SunOS 5.10 (linew)