DB: removed unused file

- Removed old and obsolete table definitions for notifications, since
  it's tables are defined in postgre.sql and v3.sql.
DB: fixed constraint creation in postgre.sql

- Fixed unique constraint on table destinations, since
  column "name" changed to "destination".
  Table definitions are ok.
- Updated DB version comment to 3.1.11 in both init files
  to reflect current version.
Add refresh authz to createGroup methods
Merge pull request #367 from stavamichal/groupManagerHasRightsToSubGroups

Add refresh authz to createGroup methods
Unpermitted logins check in module U:D:login_namespace
Merge pull request #368 from Simcsa/login

Unpermitted logins check in module U:D:login_namespace
New getMessagesByCount

- faster version
- there is no guarantee of message count returning
Merge pull request #370 from stavamichal/newGetMessagesMethodByCount

New getMessagesByCount
Substitute command "foreach" with "for"

foreach is available from Java 8, but Perun currently using only Java 7
Merge pull request #364 from zlamalp/db

DB: fixed constraint and removed unused file
RPC: set jetty plugin to latest stable jetty7

- Use latest jetty7 maven plugin.
- Fixed position of commented DB connectors in pom.xml.
RPC: updated jetty execution statement in comments in pom.xml

- If you run perun locally via jetty, you must use: mvn jetty:run-exploded
  in order to run compiled sources, otherwise configuration is taken from
  your sources and no maven filtering is performed => you end up with
  an error about unresolvable ${perun.conf} property for log4j.
RPC: use jetty 8 with AJP port configured

- For local testing of Perun we can use Jetty8 with AJP port configured,
  which makes Apache only component, that requires own install and config.
  Of course you must have SSH tunnel to devel DB or your own DB.