[PATCH] HTML export fixes

[Dirk Hohndel]

I just pushed out the latest changes.

I like the progress, but there are a couple of small things that I find
odd...

- naming of export:
  I think it would make much more sense to name the exports
  <filename_given>.html
  <filename_given>_files

  So if the user gives a filename with a suffix, remove the suffix and
  replace it with "_files" for the data directory.
  And if the user gives a filename with no suffix, add ".html" for the
  main file (and add "_files" for the folder).

- mouse hover overlay:
  the lack of units for time is a bit confusing, at first I wondered why I
  had 2,185bar in my tank at the beginning of the dive (and was briefly
  wondering about a bar/psi mixup).

- units
  speaking of which: no imperial units? That's not a requirement for GSOC,
  of course, but would be nice to have.

- Acronyms
  SAC, OTU, and CNS should be uppercase

- Gas list
  While air gets '0' as O₂ value (for reasons Linus has explained many
  times), we should show "Air" and not an O₂ of "--"

- Location / undefined
  with current master I get "Date:... Time:... undefined:...  Coordinates:..."
  I bet that's supposed to say "Divesite" or "Location" or something :-)

- precision
  this is truly a trivial nitpick... but giving pressure to two digits
  after the decimal point is a bit excessive (189.44 bar). I can see a
  point in giving one decimal as that gives similar "precision" as psi.
  I would also be fine with whole bar (no decimal) and psi to multiples of
  10 or something. In the main app we are a bit inconsistent at this time,
  that's something I wanted to fix before 4.2 and forgot about. We are
  showing whole bars but also whole psi instead of rounding to the nearest
  10 psi. There simply is no pressure sensor with 4 significant digits in
  accuracy. So this is fake precision.

  Similarly for weights. I report my weights in pounds (US pounds) and
  since Subsurface shows me kg I get things like "2.722kg" which really
  makes no sense. It's 6lbs or 2.7kg.



Now I realize this reads like a long list of complaints. Please take it as
input in making things even better. Some of them (like the "undefined"
instead of location) should be trivial fixes - actually most of them with
maybe the exception of imperial units should be fairly easy, but that's
the point. These are all minor issues in an overall very successful project!

/D