Renaud/989 shift update bug

See merge request !17

#1730 : Add listener on shift_template_registration_line to fit cooperative_state with cooperative rules

Do not allow changing the start or end *date* of a shift template because shift update won't work as expected. Changing times is still allowed.

Change to consider shift_type in LaCagette Membership, instead of admitting everybody has subscribed ftop type shift templates

Ajout liens dans le message suite absence service

See merge request !15

Make sure Odoo params to be used as integers

See merge request !14

Modify shift_registration state condition to match actual use

See merge request !13

Modify shift_registration state condition to match 'real' use

See merge request !12

Send mail after shift missing (final part)

See merge request !11