consistent location parsing

[phiweger]

• biopython FeatureLocation -> str: from zoo.parse import location_tostr(loc)

check if isinstance(loc, FeatureLocation) else return error not implemented

• str -> dict: from zoo.parse import location_fromstr(loc)

return dict

• from zoo.parse import location_extract(loc, seq)

[phiweger]

done: def location_tostr(loc)

[phiweger]

done