Brings beamed rest closer to cross staff beam. (issue 5908043)

[k-ohara5a5a]

http://codereview.appspot.com/5908043/diff/1/lily/beam.cc
File lily/beam.cc (right):

http://codereview.appspot.com/5908043/diff/1/lily/beam.cc#newcode1326
lily/beam.cc:1326: || beam->get_property_data ("direction") ==
ly_symbol2scm ("calculation-in-progress"))
Mike, any idea why you added this?
It just adds to the cases where we lie and say the beam is on the
centerline.  It causes this to go wrongly
<< {b''8[ r16. g''32] } \\ {r8 <f' g' a' b'>16. r } >>

Take a look at today's patchset at
http://codereview.appspot.com/6035053/

http://codereview.appspot.com/5908043/