SuReal(surface realization) initial version

This is the a preliminary version of Surface-realizaion(SuReal). The main function is sureal which takes in a SetLink of relex-to-logic output to parrot/echo back the sentence.  Use (r2l "some sentence") rather than (reles-parse "some sentence") to get the SetLinks for testing purposes.
It might be better to create a new directory called nlp/relex2logic or nlp/sureal, or something like that, and put these files there... the original intent of the nlp/scm was to contain generic nlp utilities, that all subsystems use.  Specific subsystems then live in their own subdirectories ...