hdf5_msb

[svn-r13842] Description:
	Fix compact dataset storage to initialize VL datatype fill values
correctly.

	Also, fix bug in global heap code when the fix action on a global
heap is to delete an object in a heap with no free space.

Tested on:
	Mac OS X/32 10.4.9 (amazon)
	FreeBSD/32 6.2 (duty)