Installation is highly manual. This documents the MotionCor2
installation procedure and automates shared file installation.
Adds 1.2.6 and 1.3.0 variants.
Builds from source based on git.
Currently only gcc/7.4.0 is used. Better performance is reported with
intel icc and MKL, but this would require additional openmpi variants.
Variants for 3.0.8 and 3.1-beta (780dd7b) are installed.