Removed old and/or deprecated methods. Cleaned up commented sections.
Replace the FF:FF:..:FF MAC adress with ISIS_ALL_L1_IS
(01:80:C2:00:00:14) and ISIS_ALL_L2_IS (01:80:C2:00:00:15) where
appropriate. 
Using L1 for Level 1 only and L2 for Level 1 and Level 1-2 on PTP. This
has no foothole in specification because we use it together with
emulating PTP over Ethernet (to simplify implementation).
ISIS: Setting of ethernet info (and possibly other layer2 control info)
moved to layer 2 module ipSplitter.
ISIS + TRILL: TRILL related layer 2 control info restructured. For
L3_MODE moved to ipSplitter (see previous commit) and for L2_MODE moved
to TRILL. That way we don't have to deal with layer 2 address
difference.
RBridge: Change of RBridge's NED model. All communications to ISIS now
goes through TRILL module for L2_MODE.
Commented out double deallocation of routes.
Added deleting unsupported messages therefore fixing "undisposed object"
warnings.
TRILL: Fixed several reasons for "undisposed object" warnings.