Add basic StMuFmsPoint class
Add StMuFmsCollection to tracked files
Add cluster and point methods to StMuFmsCollection

Most of these are not yet implemented
Implement numberOfClusters(), numberOfPoints()
Delete clusters and points in destructor

Add check for pointer validity (to hits also) as these arrays aren't
allocated unless init() is called.
Allocate cluster and point arrays
Implement cluster and point accessors