Added implementation of getNewExtendMembership(Vo, loa)
REGISTRAR: use VO's to/from mail addresses as backup for group notifications.

- When group attributes with to/from mail adresses are not set, then try to use VOs
  attributes instead. If that fails too, use backup address perun@cesnet.cz from config.
Merge pull request #473 from zlamalp/reg

REGISTRAR: use VO's to/from mail addresses as backup for group notifications.
Added implementation of getNewExtendMembership(Vo, loa)
RPC: added getNewExtendMembership(sess, vo, loa)
GUI: Display expected member expiration on app form based on loa.
Merge pull request #414 from tauceti2:getNewExtendMembership

- Added implementation of getNewExtendMembership(Vo, loa).
- Added display on application detail for new VO's applications.
Add method getResourceByName to RPC and CLI
Merge pull request #474 from stavamichal/getResourceByName

Add method getResourceByName to RPC and CLI