interp: add new ini setting 'DISABLE_AUTO_G54_ON_PROGSTOP'

[Sigma1912]

As requested here:
https://forum.linuxcnc.org/38-general-linuxcnc-questions/58821-how-to-remove-automatic-g54-after-m2-m30#346816

Adds a new ini file setting to disable the automatic resetting of the current WCS to G54 on program stop (M2/M30/M99):

[RS274NGC]
DISABLE_AUTO_G54_ON_PROGSTOP = 1

Note:
DISABLE_AUTO_G54_ON_PROGSTOP defaults to '0' so this modification of M2,M30 and M99 behavior is opt-in and default behavior is unchanged.

[BsAtHome]

This is a boolean value in a C++ program. Why are you adding it as int and initialize it with 0 (zero) instead of false (in interp_setup.cc)? Wouldn't it be more appropriate to use bool?

[Sigma1912]

Indeed, changed.

(I was following the existing setting 'disable_g92_persistence')

[BsAtHome]

This is a boolean value. You should note that it is a boolean value here.
(also the other boolean values should be marked as such, but one things at a time)

Also, you should also add it to the list of boolean values to check in src/emc/ini/linuxcnc_check_ini.py in the list of the check_bools() function.

[Sigma1912]

• Changed to '(bool, Default: 0)'. Happy to change that to another format if preferred.

• Added to the list in check_bools()

[zz912]

Can I ask you add it in to pncconf?

here:

linuxcnc/src/emc/usr_intf/pncconf/build_INI.py

Line 235 in 1c36c76

add:

        print("# When DISABLE_AUTO_G54_ON_PROGSTOP = 1'", file=file)
        print("# M2,M30 and M99 will no longer'", file=file)
        print("# automatically reset the active WCS to 'G54'", file=file)
        print("DISABLE_AUTO_G54_ON_PROGSTOP = 0", file=file)

[zz912]

I tested main functionality of this PR in Gmoccapy. It works.

[Sigma1912]

@zz912
Added as requested (I made the comment a bit more compact)