Filter fields by program and trial

BrAPI: Filter fields by program and trial

- New options menu in BrAPI Select fields activity:
 - Filter by program
 - Filter by trial
- New Select Programs activity: select one programDbId and return it
- New Select Trial activity:
 - Trial list filtered by programDbId (if available).
 - Select one trialDbId and return it.
- BrAPIService:
 - getPrograms
 - getTrials
 - getStudies: filter by programDbId and trialDbId

Fix #134
IBP-3880