nPliegos extended if nPaginas was extended by booklets method, which bugged when cXC>1, though only working for 2x1...
also, reducir message added
now really solved: problem was when number of booklets grouped increased page number, number of sheets had to be increased too accordingly
questions id for integration with webapp, sobra message not displayed if infinitesimal, integer division fixed to float for PreguntaReducir
PreguntaReducir ide
reducir question set only if not nil