added docs
may have fixed issue in forall
patched missing properties code
added missing methods to functions and other prototypes
patched failing variadic functions
improved error messages for functions in other prototypes
added replace symbol function for self references
potentially simplified self references
fixed missused substitute
removed unneeded variables
removing .o files again, since they werent the cause of the C++ build issue last time
added direct test for checking if self breaks closure
minor tweaks, still doesn't work
updated groupby
wrapped naked SEXP in Shield
retesting c powersetof
improved efficiency of xPowerSetOf using std::vector
added xIsSubset in C++
renamed xIsSubset to xIsSUbsetOf
added C++ template to more functions