fuel: on `update_record` cache passed reg in record.
records: new records
fuel: fix missing date value
new record data
mkdb.py: convert old dat files to sqlite3 db format
ignore *.db files
remove summaries.dat file
mkdb: create vehicle with integer for year
mkdb: add primary key to fuel_recs (reg, odo)
fuel: first pass cut at getting new records from db. update_recs works. new save function uses db.
fuel: do not save in calc_mpg
fuel: on `graph`, call `calc_mpg`
Merge branch 'buick' of github.com:lokidokicoki/fuel into buick

Conflicts:
	fuel.py