Re: \override Beam #'consistent-slope = ##t should be default

[Keith OHara]

There are lots of broken beams in Scriabin's first prelude
<http://imslp.org/wiki/24_Preludes,_Op.11_(Scriabin,_Aleksandr)>
The original publisher makes no attempt at consistent slopes.
Peters Edition prints nearly-equal slopes across the line-breaks, but
lets the beam height 

There is a Lilypond version at 
<http://www.mutopiaproject.org/cgibin/piece-info.cgi?id=1779>
Applying consistent-broken-slope = #t (beware the error in this thread 
subject line) produces output with distractingly strange stem lengths.

The patch at <http://codereview.appspot.com/5293060>
seems to help.  The odd stem lengths, required to match the vertical
position of the beam across the line-break, are still distracting.

Consistent slopes seem to help readability somewhat.