Added __len__ and copy() methods to GEvents Python interface.
Merge branch '00-08-02' into integration
Set GObservation::npred_spec integration precision to 1e-8.

An offset has been observed in the fitted normalization of file function models that has been tracked down to an insufficient precision in the Npred integrator (see #1142). Numerical tests have shown that increasing the precision from 1e-5 to 1e-8 solve the issue.
Remove const version of GCTAInstDir::dir() method.

Python cannot handle const declarations, hence this method was obsolete.
Set GObservation::npred_spec integration precision to 1e-6 and adapt unit tests.

A precision of 1e-8 leads to an inacceptable increase of the computing time. A precision of 1e-6 should also to the job, although results are less accurate.
Use std::log() instead of log()
Merge branch '00-08-02' into integration
Create CALDB comppliant data structure.
Move IAQ response file in bcf folder.
Add calibration index for COMPTEL response files.
Use GCaldb for response access.

Adapt the code to the usage of GCaldb for response access.
Remove GAMMALIB_CALDB environment variable from code.

The GAMMALIB_CALDB environment variable is specific to GammaLib and does not allow for a transparent usage with ctools. This special things has thus been removed.
Replace GAMMALIB_CALDB by CALDB environment variable.
Modify COMPTEL response handling.
Merge branch '00-08-02' into integration
Add Pass 7 response files.
print() method ommits printing if reduced chattiness is SILENT.
Signal that Pass 7 response files have been added.
Load map cube in GModelSpatialDiffuseCube only when needed (#1143).

The map cube is now only loaded when its values should be accessed.
Add IRF index file to Fermi/LAT caldb