Add methylasso, unix.awk

[hexylena]

Checklist

• Pull request details were added to CHANGELOG.md.
• Documentation was updated (if required).
• parameter_meta was added/updated (if required).
• Submodule branches are on develop or a tagged commit.

The awk task was written because my methylasso inputs needed to be reshaped
(Namely, subset of columns, and dividing one column by 100.)

• I didn't want to add that to the original pipeline since that format wouldn't be useful elsewhere
• I didn't want to add it to methylasso itself, since there's a chance people reuse this task in the future, I don't want to force a specific file format as input since it's useful for a couple different technologies with differently formatted outputs.