Added multi_non_iso to makefile
Program to compute number of hamiltonian cycles in a graph in multicode format
Invariant code can now be used to find minimum or maximum
Corrected comments
Main program to compute floating point invariants
Program to select graphs from an input in multicode format
Added invariant "hamiltonian cycle"-edge incidence

This is the ratio of the number of edges contained in all hamiltonian cycles and the number of edges contained in no hamiltonian cycle
Changed name of target grouping conversion programs
Program to convert genreg's shortcode to multicode