people detection / tracking (wg_perception) on indigo: easy_markers dependency

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Wow, Doctor Lu! You are God! PS: it is our Portland State University robot, MCECE bot, aka Jeeves, that runs on Ubuntu and Indigo already. And our Professor says we must have Kinect working before the end of the term! Whatever is left from the "term".

'Tis strange, 'Tis strange: I installed open_ptrack (it is their People Tracking package) and it compiled and runs beautifully on Indigo. But their site does not specify that open_ptrack must use specific versions of ROS. Somehow, it compiles on any.

Warning: building CXX leg_detector.cpp.o /face_detector/src/faces.cpp: In constructor ‘people::Faces::Faces()’: Face; std::vector<_Tp, _Alloc>::allocator_type = std::allocator<people::face>]’ [-Wconversion-null] cam_model_(NULL){ : it complains that NULL is passed to a NOT-POINTER argument

Another dependency missing: kalman_filter. I used it from hydro distribution during people package installation.

'Tis strange, 'Tis strange: I installed open_ptrack (it is their version of ROS's People Tracking package) and it compiled and runs beautifully on Indigo. But their package is in directory "hydro", yet runs beautifully. Makes me wonder how their packages have forward compatibility.