nxcomp: initial formulae

NX X compression library and proxy
x2goclient: initial formulae

X2Go Client application
mega-sdk: C++ library and ftp-like command line tool for MEGA.

Mega, Ltd. (branded as MEGA) is a file hosting service and successor to Megaupload.
symlinks: add symlinks to formulaes

Formulaes in this repo located exactly as they are in upstream.
Above allows cherry-picking of upstream changes.
We use symlinks to access formulaes as in standard tap repo.