Added select-entries-with query function.
Added exclude-entries-with to query.
Added select-entries-within-period to query.
Factored out account-contains? from select-entries-with and exclude-entries-with.
Added filter-by-account and filter-entries to query.
Added sum-by-account and filter-zero-accounts to query.
Moved bigdec= out to util.clj.
Added exclude-parent-accounts-where-child-has-same-amount to query.
Renamed some functions in query.
Added calc-total-balance to query.
Did some renaming in other functions.
Updated readme with progress.