mpl_get_symbols: Retrieves the current list of symbols.
Description
Returns a pointer to the string of character state symbols
currently being used by Morphy (i.e. either the list of symbols extracted
from the matrix, or the caller-specified values).
Usage
mpl_get_symbols(morphyobj)
Arguments
morphyobj
An instance of the Morphy object.
Value
A C-style (null-terminated) string of the character state symbols
being used. NULL if failure.