Johan Bregeon / gammalib

…rk for absolute imports that are used as standard in Python 3.

This is needed for correct catching of exceptions by the SWIG interface on some operating systems.

gammalib::expand_env replaces ~ or ~user by the user's home directory, ~+ by the value of the PWD environment variable and ~- by the value of the OLDPWD variable. If the user or the PWD or OLDPWD variable are not found, no replacement is done.
Update change-log.

… "Column separated values".

The documentation was not extended, but it was updated for better reading.

…l seem to be biased in the ellipse size.