- BFD/DFS/Dijkstra compile test is done with skeleton::GraphSkeleton graph
and skeleton::ReadMap.
- 'skeleton::' is explicitely written instead of 'using namespace ...'
in graph_test.cc
- Output messages of type "makeRep(3)..." in unionfind_test.cc have been
changed in order not to confuse compiler output parsers.

 Ugyes interaktiv kalkulator es jo vegtelen-pontossagu LGPL library:

 apt-cache show apcalc   (calc a program neve)

 Boost: felteteles template-fv definialas. Fontos!

 http://www.boost.org/libs/utility/enable_if.html

 Boost: variant. Olyasmi, mint ami nekunk kell.

 http://www.boost.org/doc/html/variant.html