Adds get_parameter_function to DSM
Adds test for get_parameter_function
Adds preload support for parameter functions (untested)
Bumps ion
Merge pull request #642 from lukecampbell/preload_work

Preload work
removed pretty print
Merge pull request #644 from mbarry02/dset_reg_fix

removed pretty print
Updates preload defs
Merge pull request #641 from swarbhanu/UNS_handles_find_events_gracefully

Fixes Ion-Alpha
Merge pull request #645 from lukecampbell/updates_preload_defs

Updates preload defs
fixed error catching