Editing calls to parallel

[Paul Villanueva]

mfpcluster and mfpsearch make use of parallel, but I forgot to change the path to the shared installation of parallel that I was using for testing.

Tasks:

• Change the hardcoded path to parallel in mfpcluster and job_header
• Update check_reqs.sh
• Update readthedocs documentation

Affected files:

• src/mfpcluster
  

  MetaFunPrimer/src/mfpcluster

  Line 144 in d65da5d

   cat command.cluster.sh | /mnt/research/germs/softwares/parallel-20181022/src/parallel  

• src/job_header
  

  MetaFunPrimer/src/job_header

  Line 19 in d65da5d

   cat << EOF | /mnt/research/germs/softwares/parallel-20181022/src/parallel 

• src/check_reqs.sh
  

  MetaFunPrimer/src/check_reqs.sh

  Line 18 in d65da5d

   requirements="diamond python blastx cd-hit clustalo-1.2.4-Ubuntu-x86_64" 

• docs/source/Installation.rst

[Paul Villanueva]

Fixed by #18.