Doc: added a first batch of model-fitting parameters to the list of measurements.

Doc: Added :param: role for SExtractor measurements parameters and modified custom CSS to manage the :param: role.
Doc: Added targetparam class and setup targets in preliminary measurement parameter list.

Doc: removed non-compliant characters in citation labels that would create problems with Sphinx v1.6+ (see https://github.com/sphinx-doc/sphinx/issues/3917).

Replaced doc PDF with (very preliminary) Sphinx source.
Pushed version number to 2.24.