Introduce bOpenManualOP compatiblity and friends

[tboegi]

See

https://gitlab.esss.lu.se/mcag/sources/tc_pils_generic/-/issues?show=eyJpaWQiOiIyIiwiZnVsbF9wYXRoIjoibWNhZy9zb3VyY2VzL3RjX3BpbHNfZ2VuZXJpYyIsImlkIjoyNTgxMH0%3D

The split of
bOpenManualOP into
bOpenManualOP1 and bOpenManualOP2 introduces a compatiblity issue:

(external) code that relied on the existance of bOpenManualOP does not compile any more.
For the state machine inside PILS we only need the information,
if any of the bOpenManualOPx buttons is pressed.
Which one is not important.
Suggestion:
Introduce helper variables, that mimic the old behaviour:
bOpenManualOP := bOpenManualOP1 OR bOpenManualOP2
(And the same for the other variables)
This avoids dependency problems 100%