Added document_multiple_records module: It allows to manage a document with a multiple records.
[IMP]comment from lp, create line for attachement if we don't get a res_model
[FIX] Partial refactoring based on MP comments
[FIX] Use attachment_document_ids to get list of attachments
[IMP] More clear message for the user
[IMP] Refresh automatically list of documents in the form view;from knownlege, delete the documents and references; when delete document from form view, juste delete the reference; informations about the model are saved in the attachment_document_ids
[IMP]Fix bug to pass tests
[IMP]Change condition to pass test
[IMP]Change condition to pass test
[i18n] Added french translations
[i18n] Updated french translations
Add missing access rights
Cleanup code and fix possible bugs

create():
    Avoid duplicating data locally
    Fix boolean comparison problem
    Use name_get rather than name field
unlink():
    Use more specific context identifiers
    Remove redundant loop and if statement
model:
    Add ondelete='cascade'
Merge pull request #5 from savoirfairelinux/document_multiple_records

[ADD] Document multiple records