Opening all patches in either side-by-side or unified view mode
failed on IE6 because we were misusing the window.open() API.
The second argument must be "_blank" to get a new window (or tab),
and must not be our own file name.
Change-Id: I00e6d487c5e657309929fb43d6205ed2aa7955c8
Signed-off-by: Shawn O. Pearce <sop@google.com>
6c39658a73