Thierry Louge / gammalib

…lients connected ti the gammalib hub

This reverts commit a9b1ce3fa9726af3d5bfe37619717e68516ede66.

Conflicts:
	registrations.txt
	src/vo/GVOHub.cpp

Conflicts:
	include/GVOHub.hpp

…his is not the way how this should work at the end, but for this intermediate development stage it's okay).

…e(), start() and print() methods and add a C++ unit test to test_GVO.

Following the recent bug discovery in the operator-= I added a bunch of unit tests to make sure that the GEnergy class is indeed doing what it is expected to do.

The -= operator made an addition instead of a subtraction.

…ons in GIntegral::romberg() method.

Conflicts:
	ChangeLog
	NEWS

The fixed number of iterations has not been correctly taken into account in the convergence testing. If alternatively the integration precision was reached, the code stopped anyways.