Removed bug: this was only true if the graph contained no bridges
Method to set signature to completely positive
Program to check whether a graph is flow-admissable using the spanning tree algorithm
Program to look for a dominating cycle through a matching and some vertices in cubic graphs
Fixed bug in method that initiated search for dominating cycle through a given matching

This bug caused several cycles to be missed when the first vertex of the first edge of the matching was adjacent to vertices in other edges in the matching.
Added program to compute chromatic number for graphs in multi_code format