Allow ?s=0 to disable server side permutation selection

The permutation selection algorithm should always work, but it
might fail on a weird browser combination we haven't seen before
that was working through the standard GWT selection process.

If the user manually adds ?s=0 to the URL we skip the server side
selection and use the stock nocache.js to allow the client to
perform the permutation selection.  It shouldn't ever be necessary,
but its good to have an escape hatch.

Change-Id: I192df745199aba3cfc8eca5b5adf509bdb280d9e
Signed-off-by: Shawn O. Pearce <sop@google.com>
1 file changed