Gonzalo Rodriguez Fernandez / gammalib

Conflicts:
	src/vo/GVOClient.cpp
	test/test_GVO.cpp
	test/test_GVO.hpp

The bilinear interpolator class holds indices and weights for bilinear interpolation. It has an interpolation operator that operates on a linear array of double precision values.

…ace for GHorizDir class and revise code.

Conflicts (resolved):
	inst/cta/include/GCTAPointing.hpp
	inst/cta/test/test_CTA.cpp

The GModelSpectralSuperExpPlaw code has been reviewed for integration into the development tree. Most changes were related to code formatting, some changes were needed in the XML interface to correctly reflect the model type "PLSuperExpCutoff".

A unit test method has been added to test_GModel, modelled on unit tests for other spectral models.

Conflicts:
	doc/source/user_manual/modules/model.rst

The GOptimizePar class has been copied over from GModelPar. The only methods that were not copied were the read() and write() methods for the XML format.

The abstract pointing class has been removed as so far no abstract pointing interface is needed.

The GWcslib class has been renamed to GWcs for consistency with the naming convention for GammaLib base classes. All WCS implementations derive now from GWcs. The code has been adapted to this new naming convention.

The Healpix pixelisation is not a World Coordinate System projection, and to make this clear the name has been changed from GWcsHPX to GHealpix. The code has been adapted to this new naming convention.

After renaming GWcs to GSkyProjection the code has been adapted to the new naming convention.

The GEnergies container class holds objects of type GEnergy.

Add GChatter argument to print() method.

The print() method now takes an argument of type GChatter to control the chattiness of the output in a homogenous manner.
Pass NORMAL chatter level in __str__ method.
Add chatter argument to print() methods.
Use GLog::chatter() method to control the chattiness of the log stream operator.
Add chatter() methods and provide member access through const references.
Add chatter() methods, provide member access through const references, and declare one liners as inline methods.

The chatter() methods control the new m_chatter attribute that is used to control the chattiness of the object's print() methods.
name() and version() methods return const references.
logFileOpen() method now sets the chattiness from the applications's chatter parameter, and name() and version() methods now return a const reference.

The GUrlString class handles reading and writing into a string.

The GContainer interface class defines the names of all methods that shall be implemented for all container classes.

All diffuse spatial models are now derived from GModelSpatialDiffuse and named GModelSpatialDiffuseXXX.