wcxf/wcxf-python: v1.5

This release adds an option sectors to the basis translation method WC.translate. Passing an iterable of sector names, this allows translation functions to optionally only translate specific sectors and return those. This allows to speed up computation time in particular in WET, where there is a large number of sectors, if only one or a few sectors are of interest. Note however that, due to backward compatibility, translation functions are free to ignore or only partially implement this feature. Thus the argument should be interpreted as "at least those sectors should be in the output".