Bug 23049: Update debit_type_code 'Res' to 'RESERVE'

Bug 23049: Update debit_type_code 'Res' to 'RESERVE'

This patch updates all cases where debit_type_code was 'Res' to
'RESERVE' which is more informative and consistent with the new style
guidelines.

The patch also ensure all calls to add_debit with a type or 'reserve'
now pass the capitalised code instead.

Signed-off-by: Séverine QUEUNE <severine.queune@bulac.fr>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>