Added some pretty-print rules. The pp table needs to be split for pgen2.0: one of the new constructors is assoc(left), but in the old syntax assoc was assoc.
Added some pretty-print rules. The pp table needs to be split for pgen2.0: one of the new constructors is assoc(left), but in the old syntax assoc was assoc.

svn path=/trunk/StrategoXT/; revision=5586

Apanatshka/strategoxt,lichtemo/strategoxt,Apanatshka/strategoxt,metaborg/strategoxt,lichtemo/strategoxt,metaborg/strategoxt,metaborg/strategoxt,metaborg/strategoxt,Apanatshka/strategoxt,Apanatshka/strategoxt,Apanatshka/strategoxt,lichtemo/strategoxt,metaborg/strategoxt,lichtemo/strategoxt,lichtemo/strategoxt