Therion

Therion is a cave mapping software which is also supported for Mac OSX. Unfortunately only by compiling. Most of the users don't know how to go through the whole compilation process and therefore there is a need for this package.

It only runs if MacTex is installed. I was not sure how to include this in the formula and hope I chose the right method. Also there is 2 audit erros

therion:
 * Don't need to interpolate "bin" with inreplace
 * Don't need to interpolate "etc" with inreplace

I have to overwrite the file content as by default, Therion tries to install everything into /usr/bin and /etc