Various updates to reduce make doc output

http://codereview.appspot.com/5727055

Patchy the autobot says: LGTM.

Julien and I have concerns about modifying the default behaviour of a few python scripts; we think they should be changed to take a --quiet option.

I'm happy to address those comments, but it'll be the weekend at the earliest.

GNUmakefile: pushes lilypond output to a logfile. Using $(*F) for the filename since the target name includes the directory. GNUmakefile.in: heeltap from previous patch lilypond-book-rules.make: removes output from pdflatex and prevents it requesting input if it fails. lysdoc-rules.make: Gets rid of echoed progress message abc2ly.py; lys-to-tely.py; midi2ly.py: Gets rid of progress message.

http://codereview.appspot.com/5727055

GNUmakefile: pushes lilypond output to a logfile. Using $(*F) for the filename since the target name includes the directory. GNUmakefile.in: heeltap from previous patch lilypond-book-rules.make: removes output from pdflatex and prevents it requesting input if it fails. lysdoc-rules.make: Gets rid of echoed progress message abc2ly.py; lys-to-tely.py; midi2ly.py: Gets rid of progress message.

http://codereview.appspot.com/5727055

Patchy the autobot says: LGTM.

Haven't actually updated the makefiles to add the --quiet flag. Will do so later today. Please leave on countdown.

GNUmakefile: pushes lilypond output to a logfile. GNUmakefile.in: heeltap from previous patch lilypond-book-rules.make: removes output from pdflatex and prevents it requesting input if it fails. lysdoc-rules.make: Gets rid of echoed progress message abc2ly.py; lys-to-tely.py; midi2ly.py: Gets rid of progress message using a --quiet flag.

http://codereview.appspot.com/5727055

Patchy the autobot says: LGTM.

Pushed as 61f11056af686fde87a1b82936cf2a073b017b88

Verified that the committish for this patch was part of the 2.15.34 release.