crypto-pnlcalc - Price-and-loss calculation

Age	Commit message (Expand)	Author
10 days	Enforce use of Decimal, formatting	uvok
10 days	Add removal methods	uvok
12 days	Format total amount in Trade	uvok
12 days	Clarify docs	uvok
12 days	decimal-or-float, conversion	uvok
12 days	Use decimal for Trades	uvok
12 days	Docstrings	uvok
12 days	Check initializer	uvok
12 days	Add method to remove coins	uvok
12 days	Make trade class immutable	uvok
12 days	Add price-per-coin property	uvok
13 days	Split files, add zest	uvok