This big patch, fix xhtml code, and user interface.
It Delete the term of budget period and use it as "Root Budget".
It add improvment on UI, adding tooltip, and table tree.
* 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
