GEOMESA-134 DTG field treatment in package object 'index' not safe

Wrap dtg variables in core.index in Options, since the temporal field in optional.
Also modify FilterToAccumulo to handle these changes.
GEOMESA-88 - Set visibilities on written data, apply authorizations to queries, allow for 3rd party service providers for authorizations
GEOMESA-136 Adding WPS processes for Geomesa Query and Geomesa Proximity Search
Updating accumulo data store to enforce existing configuration, check for user authorizations before writing
fixing formatting of comment
Updates from PR review - code style, minor refactoring
porting PR changes from 1.5 branch
fixing stuff
Merge branch 'fcr_visibility_writes' into fcr_visibility_writes1.4