gitweb: tree view: hash_base and hash are now context sensitive
gitweb: tree view: hash_base and hash are now context sensitive

In tree view, by default, hash_base is HEAD and hash is the
entry equivalent.  Else the user had selected a hash_base or
hash, say by clicking on a revision or commit, in which case
those values are used.

Signed-off-by: Luben Tuikov <fc70afabee4d46c315ca5eabc5575472d236196f@yahoo.com>
Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git