Cwl-utils

create codeseq analysis mr-c
regenerate parsers (https://github.com/common-workflow-language/cwl-utils/pull/26) illusional
bump schema-salad version (to `>=7 <8`) illusional

- update v1.0 and v1.1 parsers with optional field support (15 illusional)
- freshen testing setup (mr-c)

add v1.1 parser mr-c
add script to replace ExpressionTools with CommandLineTools mr-c

new utility: graph_split.py (a $graph splitter) mr-c
docker_extract.py:
Allow to pull images with Singularity https://github.com/common-workflow-language/cwl-utils/pull/4 khillion
Support both Singularity 2.6.1 and 3.x
image_puller.py: Change replace charcter https://github.com/common-workflow-language/cwl-utils/pull/9 manabuishii