apps: stopTime checks changed: send packet when simTime() <= stopTime

some apps tested "simTime() < stopTime", another apps tested "simTime() <= stopTime"
ieee 802.11 MAC: trivial changes

 - interface name generated by stripnonalnum()
 - const function declared as const
 - cicle iteration from begin() to end()
ieee802.11 MAC: logState(): optimised, spacing fixes in output format
WifiMode: fixing return value calculation - uses float constants instead integer
ieee 802.11 mac: optimizations: uses SIMTIME_ZERO instead 0, uses simtime_t instead double
FlatNetworkConfiguator, FlatNetworkConfigurator6: changed isIPNode detection

The non-IPNode AP, switch, etc. modules have InterfaceTable, but haven't been RoutingTable/RoutingTable6 modules