Rename min mean cycle classes and their members (#179)
with respect to the possible introduction of min ratio
cycle algorithms in the future.

The renamed classes:
- Karp --> KarpMmc
- HartmannOrlin --> HartmannOrlinMmc
- Howard --> HowardMmc

The renamed members:
- cycleLength() --> cycleCost()
- cycleArcNum() --> cycleSize()
- findMinMean() --> findCycleMean()
- Value --> Cost
- LargeValue --> LargeCost
- SetLargeValue --> SetLargeCost

SET(LEMON_INCLUDE_DIR "@CMAKE_INSTALL_PREFIX@/include" CACHE PATH "LEMON include directory")

SET(LEMON_INCLUDE_DIRS "${LEMON_INCLUDE_DIR}")

IF(UNIX)

  SET(LEMON_LIB_NAME "libemon.a")

ELSEIF(WIN32)

  SET(LEMON_LIB_NAME "lemon.lib")

ENDIF(UNIX)

SET(LEMON_LIBRARY "@CMAKE_INSTALL_PREFIX@/lib/${LEMON_LIB_NAME}" CACHE FILEPATH "LEMON library")

SET(LEMON_LIBRARIES "${LEMON_LIBRARY}")

MARK_AS_ADVANCED(LEMON_LIBRARY LEMON_INCLUDE_DIR)