The emergency position of the master controller vented the brake pipe from
every vehicle whose controller stood there, and "MainCtrl" reached the coupled
vehicles raw, so an Elf with EIMCtrlMainEmergency and one without it disagreed
by one notch (the full braking of one was the emergency brake of the other,
neutral of one a power position of the other). The pipe is now vented only
from the vehicle driven from (IsCabMaster()), and the position goes to the
coupled vehicles in the positions without the key (MainCtrlPosForCoupled(),
the emergency one as the full braking), each adding its own shift on receiving
it (MainCtrlPosFromCoupled()).
The loader's fix-up for the old MCPN=4 raises DirChangeMaxPos by the same
shift, so the reverser keeps working at the new neutral.
The Elf's master controller (EIMCtrlType 2) gets an optional emergency
brake position below its position 0, turned on by the new .fiz key
EIMCtrlMainEmergency=Yes in Cntrl (default No, no change without it).
With it the old positions move up by one (MCPN 5, neutral at 4): the
emergency position brakes fully at once and vents the brake pipe, like
the alarm chain or the Impuls's EIMCtrlEmergency. The loader raises a
too small MCPN to 5 and logs it. The Elf code with hard-coded positions
(CheckEIMIC, the MED full braking, the AI) takes the shift into account.
SVN data to change afterwards (dynamic/pkp/elf_v1, needs this exe):
- every .fiz with EIMCtrlType=2: EIMCtrlMainEmergency=Yes, MCPN=5,
DirChangeMaxPos=4 where present;
- the cab .mmd mainctrl entries: offset one notch lower (-0.06 -> -0.09),
sounds shifted one index up, new sound0 with
26284_elf_nastawnik_nagle_*.wav.
Issue: (eu07/maszyna#413)
