(svn r14672) -Fix [FS#2444]: Property 7 and callback 12 were broken for aircraft.
Now callback 12 is properly called also for 'mail'.
If the callback is not used, 'mail' uses 1/4 of property 7 (rounded up).

Makefile*
bin/*
bundle/*
!bin/data/chars.grf
!bin/data/openttdd.grf
!bin/data/openttdw.grf
!bin/data/opntitle.grf
!bin/scenario/README
!bin/scripts*
config.*
objs/*
src/rev.cpp