minor tweaks
defined values
see m1.cpp
see m2.cpp
see m3.cpp
see m4.cpp
1D mazes, not necessary (use m4, leny=0,lenz=0,lenw=0)
2D mazes, not necessary (use m4, lenz=0,lenw=0)
3D mazes, not necessary (use m4, lenw=0)
minor updates, changed 'test' to 'play'