* stepmake/aclocal.m4: use python-config for x-compile flags. Backport.

* stepmake/aclocal.m4: use python-config for x-compile flags. Backport.

* scripts/lilypond-book.py (do_process_cmd): backport: create .png
for html files. Backport.

* scm/framework-ps.scm (write-preamble): use mac-font? even if
gs-font-load is set. Backport.

* mf/feta-bolletjes.mf: fix attachment of triangle head. backport.

* mf/GNUmakefile ($(NCSB_OTFS)): backport: gen and install OTF
files, new NCSB dir handling.  backport.

* lily/music-sequence.cc (maximum_length): backport robustness fix.

* input/tutorial/GNUmakefile (EXTRA_DIST_FILES): dist html file too.

* configure.in (LINK_GXX_STATICALLY): new --with-ncsb-dir. (backport)

* config.make.in: NCSB_SOURCE_FILES

* flower/include/std-vector.hh:
(default_compare): backport: use only 1 compare optor.