much improved multi-line display of functions and coordinates
change ptr.py to be a little faster perhaps
create array of seek storage locations, to store waypoints and go to them
more detail for seekable positions
implemented reading and writing of engine.dat for tools dictionary
fix seek storing by removing mode compensation
make data file name be defined by datafilename instead of hardcoded
add seek_positions to be saved to datafile, and add names to seek positions
make seek work properly, add F1000 to all moves
make save/restore include present_position AND work properly, and automatically save/restore
new command capital-H sets Z-axis to zero at current position
add selection of current tool to save/restore file
update all displayed coordinates after changing them
make move speed slower to prevent Z+ stripping
rearrange engine.py to be more orderly, add *.dat to .gitignore