[Maxima] triginverses

[Andrej Vodopivec]

I propose we change the default value of triginverses from all to true:

(%i1) triginverses;
(%o1) all
(%i2) asin(sin(x));
(%o2) x
(%i3) asin(sin(x)), triginverses=true;
(%o3) asin(sin(x))

-- 
Andrej