
Editor improvements for example-based grammar writing:
- Remove the same language from the example language menu
- Send the other language environment to getNext
- Compile a new .pgf automatically when needed
- Update buttons automatically when functions are added or removed
- Switch over to using AbsParadigmsEng.pgf instead of the old exprToAPI function

Editor support for guided construction of linearization functions
- enter api expressions by parsing them with AbsParadigmsEng.pgf in minibar
- replace simpleParseInput with one that accepts quoted string literals
- use lexcode/unlexcode in minibar
- better support for literals in minibar (completion info from the PGF
  library should indicate if literals are acceptable)

Server support for example-based grammar writing:
- Change getNext to use info from the example language
- Random generator restricted to defined functions

- More testing
