
Bugs/Problems

- Problem with interactive help being continually sent
- Whole sheet is redrawn despite no change in cell size when
  cursor is moved (see XTable example)
- String-number comparisons don't work
- Bug(s) in __Heap_Release (-> __Flex_*ReleasePointer) ????
- Weird hang-ups occasionally with sorting!!!!
- Need to add space option before unit
- Headings are not printed
- Some formula stuff is a bit slow
- Weird bug in Evaluate_Formula which claims about 20 extra
  blocks every so often (FIXED... I think)
- Insert_Column, Insert_Row, Delete_Column & Delete_Row are broken
- Grid only plotted in white when off, not removed
- Click in window should select caret pos. not just cell
- Redraw routines very messy -> too slow if many cells
- Various minor plotting problems in low-res modes
- Overlays sometimes incorrectly redrawn
- CPicker code very very messy and unstable
- Overlays messed up when cell expanded
- Adding a column after the last leads to data corruption...
- Error on choosing of colour from colour picker
- Autosave timer is a minute too slow???
- Much too slow on ARM3 - a bit too slow on ARM610
- Function randint(n) is a bit suspect with larger values of n
- Occasional mysterious crashes after a sheet is replaced 
  (...Lose_Fonts???) and after exit...
- Only one style (+ base) per cell

Ideas 

- CHANGE INTERNAL REPRESENTATION OF DATA TO ELIMINATE
  WASTAGE WHEN CELL DATA < 96 BYTES
- Change overlays to be embedded into the sheet
- Add some more importers (PBII spreadsheet)
- Graphs
- Add export & import features for styles & constants
- Frames (aka 'big cells')

WHAT I HAVE TO DO TO MAKE THE PROGRAM PROPERLY USABLE

- Fix sorting, and column/row insertion/removal
- Finish printing
- Sheet resizing
- Help pages
- Other debugging
