Found a couple of unused variables, that I commented.
Tried to solve the program memory warning message, and failed.

Added simple endstop filter.
Corrected M114 count display.

and the mechanism so that if an endstop is hit it the ISR, the steps_to_be_taken are stored, and some current_block data that will be deleted in the next move
If the normal loop() then finds such an event, the position is calculated (floats would have taken too long in the ISR) A serial message is generated.