[bugfix] Do not read last (= empty) line into program.
Decrease foswiki export table cell size to 25.
Make Program.getFromSymbols and Program.getFromStates public.
[bugfix] Complete refactoring of toFoswikiText. Fixes several issues.

* Use Program.getFromStates and Program.getFromSymbols.
  Avoids issues with states called "" (with the current GUI these states
  cannot be created)
* Fix issue with tape value "" (with the current GUI this value cannot
  be created)
* Do not overwrite iteration variable i of outer loop in inner loop.
* Major bug:
  If instr cannot be found, do not reuse last instr instance.