Modified Symbols.hs

Added basic arithmetic functionality - it can now evaluate simple
expressions
Modified Arithmetic.hs

Updated to use a better algorithm for finding all the primes
Modified ListOps.hs

Added a bunch of sort related functionality, including parallelized
sorts
Renamed dualPivotQuickSort to dualSort
Added vector sorts that appear to be about as efficient as the built in
sorting algorithm
Modified ComplexNumbers.hs

Fixed a syntax error that was preventing other programs from using the
Complex (..) data constructor