Added include in ci_controller.h to make REGISTER_CONTROLLER macro work.
Made error messages from ARGoS exception more readable.
Corrected definition of RLOG and RLOGERR.
Fixed a couple of bugs in the use of TConfigurationNodeIterator. You can't initialize them inside a for(), otherwise weird things happen.

I must consider fixing operator=() of the iterator, to fix this.
Added stub of test footbot experiment.