Initial commit of account_dunning module

review939002

doc/index.rst

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+Account Dunning Module
+######################
+
+The account_dunning module adds dunning for receivable move lines.
+
+Procedure
+*********
+
+A *Procedure* defines the dunning process with an ordered list of levels.
+A dunning will raise from one level to an other by selecting the next level
+that pass the test.
+The Procedure is set per *Party* and a default one can be configured in the
+accounting configuration.
+
+Level
+*****
+
+A *Level* defines the parameters to reach it:
+
+- Days: The number of overdue days.
+
+Dunning
+*******
+
+A *Dunning* defines the dunning level of an overdue move line. Once processed,
+it triggers the communication defined on the procedure level. It is mainly
+defined by:
+
+- Line: The overdue move line
+- Procedure: The *Procedure* followed.
+- Level: The current *Level*.
+- Blocked: If true, it blocks the dunning to raise.
+
+The dunning can be in one of this states:
+
+* Draft
+
+  The current level is not yet processed.
+
+* Done
+
+  The current level has been processed.