Use VEP docker

[Char-Al]

It seems a good idea to use VEP docker image.

see : https://www.ensembl.org/info/docs/tools/vep/script/vep_download.html#docker

[kyauy]

could be very nice, currently have hard time to install VEP...

[ardoli]

singularity container is now installed and tested on the cluster.

[ardoli]

may be have 2 installations:

• one singularity container for seal's server, for instant annotation.
  --> need to update the way to launch vep in seal
• the singularity container one the cluster, for asynchronous, and may be bulk, annotations.
  --> 1 - use only VEP annotated VCFs
  --> 2 - use a directory to put unannotated VCFs, and wait for get VEP annotated VCFs complete files generated by a cron job on cluster.