(svn r10879) [NewGRF_ports] -Feature: Added support for special orders, with addition of <data> byte in FSM command:
7B - force change of heading to <data>
7D - choose helipad from nominated group <data>
7E - choose terminal from nominated group <data>
-Change: Recoded terminal and helipad selection to default to All terms, or use the specific named one.
-Add: Added supporting function CanReserveBlocks. This has different logic to HasBlocks, where if the vehicle already owns some of the blocks, but the "missing" ones are free, then it can reserve those too. HasBlocks was all-or-fail.
-Change: updated airportsbasic.grf to match.

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