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Fixes a regression introduced in d9ce986b whereby filtering arguments
were no longer passed to 'load_data_from_text'.

Reported by Romain Pacanowski.

Before, no filtering would take place: elements would always be left in
'contents'.  Furthermore, we could forget to read interval data, leading
to errors down the path.

The logic was obviously false, and thus the following
'read_confidence_interval' was skipped altogether.

Partly fixes a regression introduced in f8843e56.
Reported by Laurent BELCOUR <laurent.belcour@gmail.com>
at <http://lists.gforge.inria.fr/pipermail/alta-devel/2017-January/000746.html>.

Partly fixes a regression introduced in f8843e56.
Reported by Laurent BELCOUR <laurent.belcour@gmail.com>
at <http://lists.gforge.inria.fr/pipermail/alta-devel/2017-January/000746.html>.

 Added two static functions to test whether or not a geometrical configuration is above the hemisphere
 Added a new unit test for the params::is_above_hemisphere static function