rename mkdb as dbi. update other code to match
init.py: empty to inidicate `ok to load from this directory`
cli.py: stub class for command line interface
fuel: import and init stub cli
rename fuel as main
functions: new modular version. non-working at present
cli & functions: migrate show_summary, predict and graph to cli.
cli & functions: migrate add/update fuel record

also, on functions.save, commit db changes
migrate add/choose/update service records
migrate vehicle stuff: TODO: chekc it all works
functions: on `fuel_graph` only generate is we have records
cli: remove call to fuel_graph. add help stub. TODO: add help!
cli & FN: new `FN.time_now` function gets current time. on new record, set date to time_now
tkgui.py: tkinter stub
cli: new `start` function that all interfaces will have
main: include options to lauch tkinter gui
tkgui: testing the menu
move cli to subdir
gtk instead of tkinter. pseudo main menu. spacing is ... odd
cli/help.py: stub help module