Follow-up Bug 5634: Ordering branches should be case independent

Follow-up Bug 5634: Ordering branches should be case independent

This patch fix the order of branches in the log-in page,
on Branch.pm we added the variable branchcode to the
hash returned by GetBranchesLoop, and this function is used
on Auth.pm to get a list of branches ordered by branchname

To test
1) Use an installation with some branches
2) On login screen the branches are ordered by branchcode
3) apply the patch
4) On login screen the branches are now ordered by branchname

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
This patch works as expected. Before applying the patch the branches
with lower case was at the end of the list. Now they are well ordered.
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>