MEDYAN.fil_num_unmin_ends
Tuple{MEDYAN.Context, Int64, Int64}
Return a tuple (minus, plus) of the number of unminimized monomers on the minus and plus end of a filament.
This will be reset to (0, 0) by minimize_energy!
When an end is depolymerized this will decrease, but saturate at 0. When an end is polymerized this will increase.
For example if after minimization a filament has a plus end depolymerization, this function will return (0, 0). Then if a plus end polymerization happens, this function will return (0, 1), even though the net change in filament length is zero.