* Issue #15: add the entry 'files to convert' into the translators' sections of the document's configuration file.
* Issue #15: update autolatex.pl and Translator.pm to take into account the configurations' entries 'files to convert'.
* Issue #15: Add 'get images' in the bakcend.
* Issue #15: Add the command 'set images' in the backend.
* Gedit: Fixing the number of rows in the table of the configuration panel for the figures' generation.
* Issue #15: Add a configuration panel in the Gedit plugin that is displaying the list of the figures and the associated translators. This panel enables to change the translator to use to convert the figure.