Simplify handling of trig bases
Simplify handling of trig bases

Following discussion on #phasers, we've decided it's not worthwhile to
have a second argument on trig functions, nor for methods to look at
CALLER.  C<use trigbase> has been redefined to still be useful, and
is also extensible, if Gradians aren't exotic enough for you.

prammer/specs,prammer/specs,tokuhirom/specs,perl6/specs,tokuhirom/specs,prammer/specs,tokuhirom/specs,perl6/specs