Read a parameter type or decorator list from a file.
Lines in these files have the format
“SMARTS/SMIRKS shorthand”
lines beginning with ‘%’ are ignored
Parameters:
filename:str
Path and name of file to be read
Could be file in openforcefield/data/
Returns:
typelist:list of tuples
Typelist[i] is element i of the typelist in format (smarts, shorthand)