selection_change_with is not correctly initialized for Reference

selection_change_with is initialized to None and so fields.depends fails later to update the value.
Also it is missing the same deprecation warning as the Selection field.

assigned to @ced

added trytond type::crash + 1 deleted label

Here is the review14091002

Also the check_relation method doesn't manage the correctly the method in case of selection_change_with.

New changeset 56dc5c74d052 by C?dric Krier in branch 'default':
Fix selection_change_with
http://hg.tryton.org/trytond/rev/56dc5c74d052

added 1 deleted label and removed 1 deleted label

closed

New changeset 6a89885653a9 by C?dric Krier in branch '3.4':
Fix selection_change_with
http://hg.tryton.org/trytond/rev/6a89885653a9

New changeset 36a943034536 by C?dric Krier in branch '3.2':
Fix selection_change_with
http://hg.tryton.org/trytond/rev/36a943034536

New changeset ae4cbee92455 by C?dric Krier in branch '3.0':
Fix selection_change_with
http://hg.tryton.org/trytond/rev/ae4cbee92455

New changeset 675598c4d94e by C?dric Krier in branch '2.8':
Fix selection_change_with
http://hg.tryton.org/trytond/rev/675598c4d94e