Initial commit of sale_invoice_grouping module

review931002

doc/index.rst

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+Sale Invoice Grouping Module
+############################
+
+The ``sale_invoice_grouping`` module adds an option to define how invoice lines
+generated from sales will be grouped.
+
+A field is added to the *Party*:
+
+- *Sale Invoice Grouping Method*: The method used when grouping invoice lines.
+
+If the Standard method is used, invoice lines generated will be added to the
+first matching invoice found. If no invoice matches sale attributes then a new
+one will be created. Invoices not created by the sale process are not taken
+into account when looking for a candidate invoice to add invoice lines to.