Moved contextual nav items back to a sidebar.

Global nav items remain in piggy menu.

This is an adaptation of https://camlistore-review.googlesource.com/#/c/3898/ by Mario Russo <mail.mr@gmail.com>.

Change-Id: I85f7f386aa0573026253e13c5bd12b46ad08f83a
Fix badly aligned piggy animation in upload dialog.

Change-Id: I69e9432a90382a2ece9c5f77c089de7f7c9ea492