Log Message:
math/qcalc: update to 0.2.3

0.2.3
 - Remove default interpreted functions. Add more built in functions such as
   degs, rads, sqrt, sq, cube, cbrt, round

0.2.2
 - Trying to declare a function with duplicated parameters now results in an
   error message

0.2.0
 - Users may now create custom functions fn myfun(x, y) x + y which features
   closures