STP/RSTP: mixed fixes
RSTP: reindent; added spaces around '<<', 'if', 'for', etc
RSTP: printState() simplified
RSTP: added FIXMEs: replace magic numbers with constants in the code, etc!

RSTP: more FIXMEs
RSTP: printState()
MACAddressTable: cosmetics
MACAddressTable: made addressTable inspectable
Ieee8021d examples: README: some editing