Michael Mayer / ctools

Conflicts:
	ChangeLog
	NEWS

…erLM logger constructor interface (now takes a pointer instead of a reference).

Conflicts:
	ChangeLog
	NEWS
	src/ctbkgcube/ctbkgcube.cpp
	test/test_ctools.sh

… GCTAExposure to GCTACubeExposure and GCTAMeanPsf to GCTACubePsf).

Conflicts:
	ChangeLog
	NEWS

The memory needs for ctobssim have been reduced by first working on a local copy of the CTA observation (this de-allocates properly and memory cache associated to the response functions), and by saving and disposing the event lists immediately if called using the execute() method (this is the method called when the tool is run from the command line).

ctmodel now always produces a single model cube on output. There are two important input parameters: "infile" and "obsfile". "infile" specifies a counts or model cube that is used to define the binning of the model cube. The functionnality for this parameter is as before. If "infile=NONE", the cube will be defined according to task parameters that specify the spatial and the energy binning. The "obsfile" parameter is new and allows specifying the observation definition for which the model cube should be computed. If an event list or a counts cube is presented, the pointing and Good Time Intervals will be extracted from the FITS file header. If an observation definition XML file is presented, ctmodel will now loop over all CTA observations in the file and add the model values to the model cube. If no response information is associated to the "obsfile" (which is typically the case for event lists or counts cubes), the "caldb" and "irf" parameters will be used to identify the response.

The ctbkgcube tool generates a background model for cube-style analysis.

* Checked the code for coding conventions.
* Renamed the angular seperation user parameters to amax and anumbins. "a" stands for angular separation, "d" for delta is less explicit.
* Add ctpsfcube executable unit test