* fix a bug for new orders budget : the Asort1 was displayed by default. Now, it's the sortN_authcat of the 1st budget (the one selected by default)
* change in GetBudgetAuthCats : returns all auth values used by at least one budget (not Asort* categories, as previously)
* code cleaning in GetAuthvalueDropbox (and select aqbudgets.* instead of *, to avoid data corruption due to duplicate column name)
* budget period management
* budget management (budgets lines are defined for a given budget period)
budget_owner_search is the popup to select a librarian as budget owner