Resolve "Mummer4 task"

Mummer4 Task

Description

Please include a summary of the new WDL-task or a new version of an existing task. Please also include relevant motivation and context.

Required Files

Please provide the following files and data set:

• README.md - include things like software versions, links to the software documentation
• *.wdl files
• input.json - this should work for the test and not necessarily specific to the subworkflow
• Dockerfile (optional)
• Link to the test data

PR Self Evaluation

• All wdl & json files exist
• Test input files have been added to cori: portal
• pytest-workflow succeeded

Closes #7 (closed)