add daily_points calculation and improve output of food form
modified .gitignore
reorganise enter.py into __init__ food, train and utils
rename read_database and write_database to read_db and write_db
train: fix some bugs
remove some clutter
add foods form to adjust points value of foods
utils: automatically add missing tables to db in read_db and add parse_date()
food: use utils.parse_date
add prehab form (in mould of food form)