Added supporting files for self-dual* classification. This commit consist of functions
to evaluate the exact SD representative for a given truth table;
find out total number of functions in a particular variable numbered function. Similar to npn_enumeration.cpp (in ./examples/);
other supporting functions to calculate the SD equivalent;
test functions (in ./test/)
*Switching functions that become identical by self-dualization, non self-dualization, negation of variables or the function, or permutation of variables are called SD-equivalent.
Added supporting files for self-dual* classification. This commit consist of functions
*Switching functions that become identical by self-dualization, non self-dualization, negation of variables or the function, or permutation of variables are called SD-equivalent.