Adds tools to gce image requested by Stanford collab.  Updates samtools & eigen. - Adds plink, pseq, and gvcftools - Bumped eigen to newest version - Updated samtools to master branch (now three packages) - Fixed a broken perl path - Added some useful unix commands: screen, tmux
Adds tools to gce image requested by Stanford collab.  Updates samtools & eigen.
- Adds plink, pseq, and gvcftools
- Bumped eigen to newest version
- Updated samtools to master branch (now three packages)
- Fixed a broken perl path
- Added some useful unix commands: screen, tmux

Tested:
Successfully was able to create new image.
Checked new binaries got installed.
Running the vcf-merge perl script no longer gives an error.

deflaux/gce-images,deflaux/gce-images