Cleaning of heap test and bug fix in heap concept check (ticket #100)

* The dijkstra heap test's digraph is inlined into the source file
* The random sequences are fixed
* The content of the header is moved to the source file
* Only the binary heap is checked

 include_directories (${LEMON_SOURCE_DIR})

 add_library (lemon arg_parser.cc base.cc color.cc random.cc)