- parser.pl
  o edge/7 arugment rearrangement
  o select_next modified
  o init_chart looks for empty phon signs
  
- io.pl 
  o writesem/1 instead of writesem/2
  
- main.pl 
  o all "dynamic" declarations now here

- lex.pl
  o empty phon signs
  o select1 argument expansion

- utils.pl
  o lookup/3 new clause

- constraints.pl
  o nfp/6 Nonlocal Feature Principle
  o new combine/4

- treetool.pl
  o edge/7 rearrangement
