Squashed commit of the following:

commit 6f3dc1855751eac2350db944c71cf21262eff1fc
Author: Francisco <francisco@eneas.(none)>
Date:   Mon Dec 22 15:38:03 2014 -0300

     > Subroutines conmut, conmutc and conmutcc replaced by function
       commutator inside mathsubs.

&OLDER