Greatly extend and improve the test file for adaptors (#67)

- Add concept checks for the alterable, extendable, erasable
and clearable adaptors.
- Add test cases for modifying the underlying graphs through adaptors
whenever it is possible.
- Check the conversions between Node, Arc and Edge types.
- Add more test cases for the adaptor-specific functions and maps:
enable(), disable(), status(), forward(), backward(), CombinedArcMap,
CombinedNodeMap, ResidualCapacity etc.
- Use checkGraphIncEdgeArcLists() to simplify the test cases for
undirected graphs.
- Add test cases that use static graph structure (GridGraph) with
several adaptors combined.
- Add comments for the test cases.

INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR})

ADD_LIBRARY(lemon

  arg_parser.cc

  base.cc

  color.cc

  random.cc)

INSTALL(

  TARGETS lemon

  ARCHIVE DESTINATION lib

  COMPONENT library)

INSTALL(

  DIRECTORY . bits concepts

  DESTINATION include/lemon

  COMPONENT headers

  FILES_MATCHING PATTERN "*.h")