JPSSnagg

nagg_write_granules.c
	Discontinued aoutomatic writing of missing granules by the write_granules module.  Missing granules are now to be sent explicitly from nagg_main/nagg_select_granules.
	Refactoring:
		Extracted code into new functions create_aggregate_dataset, copy_granule_hyperslabs, and several functions to assemble paths to groups and datasets.
		Added more function headers.

Tested on jam and amani.