Extend and modify the interface of matching algorithms (#265)

- Rename decomposition() to status() in MaxMatching.
- Add a new query function statusMap() to MaxMatching.
- Add a new query function matchingMap() to all the three classes.
- Rename matchingValue() to matchingWeight() in the weighted
matching classes.

 SET(PROJECT_NAME "@PACKAGE_NAME@")

 SET(PROJECT_VERSION "@PACKAGE_VERSION@" CACHE STRING "LEMON version string.")