Commiting all that allows Branch Independancy management :

Commiting all that allows Branch Independancy management :
* in acquisition module, an order can be modified/recieved/closed only by a librarian from the same branch than the librarian that created the basket.
* in catalogue module, an item can be modified/deleted/created only by a librarian from the same branch as item owner branch
* in members module, a member can be created/modified only by a librarian from the branch of the member.
Modifying Context.pm :
Adding userenv context variable.
Is set during checkauth or get_template_and_user
Modifying Auth.pm function checkauth : setting userenv context variable
Modifying Acquisition.pm:
    * histsearch
    * branches
    * bookfunds
    * getsupplierlistwithlateorders
    * getlateorders
    * getallorders
    * getorders
Add a branch criterium if IndependantBranches is set.
Modifiying Suggestion.pm:
    * searchsuggestions Will look first for th Librarian Branch and restrict search to suggestion made by users from this branch
    * countsuggestions Will look first for th Librarian Branch and restrict search to suggestion made by users from this branch
File Modifiying :
    * admin/aqbudget.pl adding a branch selection for budget.
    * parameters/aqbudget.tmpl
    * admin/aqbookfund.pl adding a branch selection for bookfund
    * parameters/aqookfund.tmpl
And adding branch selection to members and items changes.
WARNING: bibid are still used in additem, unlike in HEAD... Shall be soon fixed.