`categorize_data` is the new entry for data categorization and receives
a DBManager. Contains the categorizing logic.
Categorizer configuration now done solely from categories.yaml file.
Ancilliary database methods added to DBManager required for categorizing
transactions.
Adds categorize to command line options.
Removes obsolete restart options and method from runnable.py.
Fixes parse and categorize method, now take cmd line arguments and
`DBManager`.
Removes obsolete tools.py, all functions already rewritten in relevant
modules.
Updated categories.yaml with new keys.
Two new graphs created, discrete, where all discretionary expenses are
plotted, and average, for the yearly average. This later one will be
moved to report form.
Health expenses separated from required. Commute moved from fixed to
required expenses.
New by_month_and_category functions added to transactions.py.
Moves all graph and matplotlib dependencies to graph.py.
Moves Transactions and Categories methods outside the class for better
visibility.
Variable expenses renamed to required.
transactions.py now has by_year, by_month, by_categories in global scope
and slightly improved perfomance.
Add new tools.py to handle subcommands.
Most workflow moved to subcommands handlers, which in turn calls
tools.py functions.
Moves internal state (dict which gets parsed into PFState) to folder
.pfstate (sort of like git) and renamed to state.
New PFState class and factory pfstate function added.
*.pickle changed to .pfstate on .gitignore. Everything local stored in
.pfstate.
Adds vacation, status and backup commands. Modifies init, restart and
parse to receive PFState and call tools functions.
Vacation can add, list or remove vacations date intervals.
Backup saves either a full transaction list or the entire data folder
into .pfstate/backup folder.
Categorization functions moves to tools, deleted old one on
categories.py.
Moves parse_data and load_transactions/save_trasactions outside of
respective class to global scope.
Travel category class moved to the end of file, since it uses others in
its search method.
Removes unused initializer.py file.
