[trunk] type 'string' instead of type 'char' in some fields.function

[Sébastien Alix]

It seems that some field types are mistyped in the 'crm' and 'sale_crm' modules, a type 'string' is used instead of the 'char' one:

./sale_crm/sale_crm.py:105: type='string', readonly=True, multi='_get_sale_orders_data',
./sale_crm/sale_crm.py:108: type='string', readonly=True, multi='_get_sale_orders_data',
./sale_crm/sale_crm.py:111: type='string', readonly=True,
./crm/crm.py:181: type="string", readonly=True, multi='_get_opportunities_data',
./crm/crm.py:184: type="string", readonly=True, multi='_get_opportunities_data',

As I haven't found the 'string' type in openerp/osv/fields.py, I think it's a bug? It causes some issues when we're inspecting data model through the "fields_get()" method for instance.

Seen on trunk revision 9196.