Added commands to proxy

Exceptions now close the offending connection
NNTP Proxy fix

Removed invalidate from exception
Fixed typo in schema.mysql
Fixed bugs in NNTP Proxy

Actually print status line for LIST ACTIVE
Added connection identifer (local port of connection)
Tidied up constructor so that all instance attributes required in
destructor are initialised early on (before an exception can occur)
Merge remote-tracking branch 'upstream/dev' into dev

Conflicts:
	db/schema.mysql
	misc/update_scripts/python_scripts/nntpproxy.py
Reordered site entry for nntpproxy
Merge pull request #968 from greenbender/dev

NNTP Proxy fixes