[IMP] - Make one migration from 12.0.1 to 12.0.4

[RMV] - Remove empty file

[IMP] - Update no_update cron after migration

[IMP] - move contract template recurrence info to line level

[FIX] - Fix contract line model description

[IMP] - Link contracts to analytic accounts

[FIX] - Fix pylint

[IMP] - Move chatter and attachments from analytic account to contract

[IMP] - Move account_analytic_id to contract line level

[IMP] - Improve version check in migration script

[IMP] - Move contracts followers from analytic accounts

[ADD] - Add mail.activity.mixin to contract.contract model

remove data drop from migration scripts

[12.0][FIX] - Fix _init_last_date_invoiced

fix flake8

[ADD] - Update contributors list

contract/views/contract.xml

@@ -105,8 +105,8 @@
                     </notebook>
                 </sheet>
                 <div class="oe_chatter">
-                    <field name="message_follower_ids"
-                           widget="mail_followers"/>
+                    <field name="message_follower_ids" widget="mail_followers"/>
+                    <field name="activity_ids" widget="mail_activity"/>
                     <field name="message_ids" widget="mail_thread"/>
                 </div>
             </form>

contract/views/contract_line.xml

@@ -35,6 +35,11 @@
                     <field name="successor_contract_line_id"/>
                 </group>
             </group>
+            <group name="recurrence_info" position="after">
+                <group name="analytic" groups="analytic.group_analytic_accounting">
+                    <field name="analytic_account_id"/>
+                </group>
+            </group>
         </field>
     </record>
 
@@ -79,6 +84,7 @@
                 <field name="sequence" widget="handle"/>
                 <field name="product_id"/>
                 <field name="name"/>
+                <field name="analytic_account_id" groups="analytic.group_analytic_accounting"/>
                 <field name="quantity"/>
                 <field name="uom_id"/>
                 <field name="automatic_price"/>