Adding a glossary

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+.. _section_glossary:
+
+Glossary
+========
+
+.. glossary::
+   :sorted:
+
+   case
+      One case is defined by a set of data and of choices, packed together
+      through the user interface of the module. The data are physical
+      measurements that have to be available before or during the case
+      execution. The simulation code(s) and the assimilation methods and
+      parameters has to be chosen, they define the execution properties of the
+      case.
+
+   iteration
+      One iteration occurs when using iterative optimizers (e.g. 3DVAR), and it
+      is entirely hidden in the main YACS OptimizerLoop Node named
+      "compute_bloc". Nevertheless, the user can watch the iterative process
+      throught the *YACS Container Log* window, which is updated during the
+      process, and using *Observers* attached to calculation variables.