Fix grammar and Sum bug.
Generalize definition of SumExpr a little...Lets sum all elements of the set S.R... Brian
Completed support for generating C code.
Checking in changes that: 1) Generate C99 code instead of C++ code. The code should still work with a C++ compiler. 2) PrintWrapper class to enable putting declarations at top of functions so we can make old versions of gcc work.
Generate code to compute the sum. Bug fix for adding tuples of integers to a relation.
Bug fixes for parsing sum expressions.
Adding support for sum expressions.