1.4beta

- Spreadsheet tooltip's row,column view was inverted, fixed

- Reworked function help, now alphabetical per category

- F2 toggles between table and edit modes (was: go to edit mode)

- trigger now includes the value of exactly 0 in its checks

- renamed sassy's polyphonic channels to note numbers to avoid confusion

- new: .mid file player

- new: midichannel(nn) to report which midi channel note came from

- new: per-channel midi inputs (midion(ch,nn) etc)

-> now there's three separate midi input methods, will need clarification

   in documentation..

- midioutpot() was doing something completely weird, fixed

- new: context menu insert/delete rows/columns

- new: context menu copy current cell name / area selection name to clipboard

- new: scale(), convert notes into a scale, to make random notes nicer

- new: distort(), a smooth clipping function

- used-by lines were not cleared when cell was deleted, fixed