Prevent from deleting lines which have activities on them or their content:

- Define variation_not_defined missing at top level
- Factorise line deletion code
- Make recursive checks on deleted document to check for activity presence
- Only execute document creation code if deletion ended without error
- Move pre-error-exit line deletion to code branch creating new lines
- Add a new error message when there are pending activities (only displays the first activity found)

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@20320 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_banking_core/bt/revision

-429
\ No newline at end of file
+430
\ No newline at end of file