Machine readability changes and typo/description, and minor consistency fixes

[davidbenncsiro]

@CyprienBosserelle, commits for #35 and #36 are on this PR. Probably best to handle other open issues on a separate branch.

Questions & comments:

• As discussed on Jul 13 call, changed bedrock to reef in 2 places.
• I wasn't sure how to best change hwci's description (apart from expanding the first word) "Min depth for wci. aka no wci in water depth shallower than this."
  • replace "wci" with "wave current interaction (wci)"
• [] is used as the default for files; should it be ""? [] to me suggests list, specifically the empty list
  • DONE
• Line 468: "You can specify the same varibale twice but you would be a fool."'
  • LOL
  • fixed "varibale" typo BTW
• References to Mars and rum in g and rho descriptions: LOL

[davidbenncsiro]

BTW @CyprienBosserelle, I can add new issues for each of the bullets I raised above under Questions & comments if it helps.