[IMP] sales_team: Force a tree view in Sales team tab to avoid to show unnecessary informations like last login date
[FIX] website_sale: pay now button should be translatable
[FIX] survey: trace the partner_id taking the survey; if no token, set as the current user's partner.
[FIX] account, bank statement reconciliation: fixed use cases involving transactions made in a different currency than the company AND the statement ones
[ADD] initial theme guide + scaffolding

incomplete, incorrect, committed for testing
[FIX] fields: avoid prefetching of one2many fields

When reading a one2many field, the inverse mapping of the lines (matching m2o -> lines of corresponding record) was instantiating each line and then triggering the prefect of fields.
To improve the performances, the inverse mapping is done in sql to avoid triggering the prefetching.
[IMP] fields: update inverse fields lazily for performance

When a relational field is assigned in an onchange, its inverse field is
updated in cache.  Reading the current value of the inverse field may be
costly, for instance in the case of a one2many field with thousands of records
as a value.  Instead, put in cache a SpecialValue that reads and updates the
field; it will be triggered only when it is accessed.