Display Dashboard icon instead of the home icon in toolbar when the link leads to Dashboard.

props ghost1227.
fixes #26754.

git-svn-id: https://develop.svn.wordpress.org/trunk@28599 602fd350-edb4-49c9-b593-d223f7449a82
Fix displaying taxonomies in bulk edit if the post type does not support titles.

props scribu.
fixes #16793.

git-svn-id: https://develop.svn.wordpress.org/trunk@28600 602fd350-edb4-49c9-b593-d223f7449a82