Merge remote-tracking branch 'origin/optimize_data_path'

* origin/optimize_data_path:
  optimize geojson import
Merge remote-tracking branch 'origin/select_timestep_and_variables'

* origin/select_timestep_and_variables:
  Allow user to choose specific time and variables.

Conflicts:
	modules/vtk_reader.py
Fix selectable timestep

type and sanity checks were broken in original commit that added time
Merge branch 'fix_stuck_time' into next

Conflicts:
	modules/vtk_reader.py