M666

+ tower radians absolute value

Giving a negative number of probe points disables the tower angle
correction calibration ('4point' instead of '7point' solution)

EEPROM version updated

Avoids to have to recalibrate the delta_height after a z_offset change

More consistent with M665 where C-value is allowed as well, then
normalized

Adding '7-point' tower angle correction calibration

- adding Cn 5, 6 and 7

and getting rid off verbose level 3 and configuration_adv settings

- Making M665 compatible with repetier (see
http://reprap.org/wiki/G_code#M665:_Set_delta_configuration)

- M665 B also sets the radius for manual calibration menu

- Converting tower ajustment definitions to arrays - tower angle
corrections compatible with Esher 3D wizzard

- Only tower angles need to be adjustable with M665 and stored to EEPROM
- tower radius and diag rod can be adjusted in the FW only with #define

Refresh Marlin git helper scripts

- `mfadd` adds and fetches a user’s fork of Marlin
- `mfqp` invokes `git commit -m`, `mfrb`, `git push -f`

FLSUN and trailing whitespace cleanup

Add and apply interrupt helper macros

Cleanup after some direct commits

Fix double definition in configuration_store

https://github.com/MarlinFirmware/Marlin/commit/5e9726530f
ac1b9437c2

M43 Toggle & Z servo test - fix bug & add another check

Add Linear Advance values to EEPROM and LCD

Fix Makefile build

- use volatile for registers
- avoid implicit casts

Only queue babysteps if axis is in a known position

Identifed a display initialization issue.