Auto_Bed_Leveling: Enhanced G29 command

[DarkAlchemist]

I guarantee you that ABL is not out of the way. My EEPROM is off by default and when I freshly turn on the machine I *must* do a g28 first or it will go slowly and all axis move when all I wanted to do, for example, is Z +10mm. A major pita when I am doing stuff that must immediately stop and move or burn something. So, I am stumped and all I want is the g28 part of ABL and not a piece of any thing else so I have a dynamic Z endstop and none of the matrix affecting me like this.

// EEPROM
// The microcontroller can store settings in the EEPROM, e.g. max velocity...
// M500 - stores parameters in EEPROM
// M501 - reads parameters from EEPROM (if you need reset them after you changed them temporarily).
// M502 - reverts to the default "factory settings".  You still need to store them in EEPROM afterwards if you want to.
//define this to enable EEPROM support
//#define EEPROM_SETTINGS
//to disable EEPROM Serial responses and decrease program space by ~1700 byte: comment this out:
// please keep turned on if you can.
//#define EEPROM_CHITCHAT