Fixed RFC 4235 notifications compliance.

The RFC states that a NOTIFY sent after a SUBSCRIBE (initial
or refreshed) must contain a full state notification.
However, a NOTIFY sent after a PUBLISH must contain a partial state
indicating the specific state change.

Without this patch, OpenSIPS actually publishes a full state
notification in all cases (despite announcing a partial notification),
making the publish ordering fix patch useless.
Code beautification.

Use a 4-chars wide tab for indentation instead of spaces.
Merge pull request #62 from dsandras/ds-dialoginfo-notifications-fixes

Fixed RFC 4235 notifications compliance.