Several changes in Kruskal alg.
- Input object interface was changed to an STL compatible one.
- template parameters of class KruskalPairVec has been simplified.
- (the most of) the names meet the naming conventions.
- a lot of (but still not enough) documentation has been added.
- class KruskalMapVec has been commented out.

#include "test_tools.h"

int main() 

{

  check(false, "Don't panic. Failing is the right behaviour.");

  return 0;

}