Preload updates to support QC GRT attachment

Conflicts:
	extern/ion-definitions
	ion/processes/bootstrap/ion_loader.py
Cleaned up precision mgmt
Adds some visibility limitation on lookup params
Fixes for pydap support
Updates ion-defs ref
Fixes type issue
Adds precision formatting to get_last_granule in DPMS
fix param creation for test
Finalizes QC and simulator support
Merge pull request #991 from shenrie/master

Fix AS integration tests
Fixes test_global_range_lookup
Merge pull request #989 from newbrough/preload_external_data

fix param creation for test
Fixes test_row_values
Removed obsolete test
Merge pull request #981 from lukecampbell/qc

QC Work
bump pyon for json/unicode fix and endpoint exception fix
catching Timout exceptions and removed commented code
Fixed merge issues
Update visualization transform to remove messaging call during granule processing