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h1. GammaLib-00-09-00 release

This is the last release before the version 1.0.0 release of GammaLib. The release contains basically all features that are planned for release 1.0.0 and serves as pre-release for validating the code prior to the 1.0.0 release.

The following changes have been implemented with respect to the previous release:
* Add energy dispersion to CTA module
* Add pointing table support to CTA module
* Add event filtering for binned analysis
* Add +=, -=, *= and /= operators to GSkymap
* Add integration status tracking to GIntegral
* Add GCTAExposure and GCTAMeanPsf classes
* Add ts and tscalc attributes to GModel and use them in models
* Add manipulation methods to GCTAResponseTable
* Add read(), write() and save() methods to GCTAPsf2D and GCTAPsfKing
* Add classname() method to all classes
* Add utc() methods to GTime class
* Add hierachical element access methods to GXml and GXmlNode
* Add table creation and saving methods to GCsv class
* Add predefined entity support to XML module
* Read/write altitude and azimuth attributes of CTA data
* Refactor CTA response class, add GCTAResponseCube class
* Improve CTA response computation for extended models
* Implement CTA stacked analysis
* Optimize CTA binned and stacked analysis
* LM optimizer now allows logL decreases up to 1.0
* Load events only when needed into GCTAObservation
* Implement full automatic typecasting in Python module
* Fill DETX and DETY values in GCTAResponseIrf::mc 
* Rename GCTAModelBackground to GCTAModelCubeBackground
* Rename GCTAModelInstBackground to GCTAModelIrfBackground
* Rename GIntegral::romb() to GIntegral::romberg()
* Correctly take into account logfile name change in Python
* Correctly use DETX/DETY in radians in GCTAInstDir
* Introduce class codes to avoid dynamic type casting
* Remove error computation from optimization
* Add GOptimize::errors() method for error computation
* Add support for user and save CTA energy thresholds
* Several bug corrections