Fix bugs with intermol interactions and DD

Fix bugs with intermol interactions and DD

Fixed two array access issues with the combination of intermolecular
interactions with domain decomposition when special bonded
communication was used. This could not lead to silent errors.
Added intermolecular interactions to the DD maximum distance check.
Disabled (fatal error) the above combination with charge groups.

Also fixed longest 2-body interaction distance print in case the
longest distance is in an exclusion.

Fixes #1820

Change-Id: Ic48d313edbc9779219832a185a903627f39b3102