* Documentation/topdocs/NEWS.texi: Add note about info docs with

* Documentation/topdocs/NEWS.texi: Add note about info docs with
images.

* Documentation/user/lilypond.tely (@direntry): Update.

* stepmake/stepmake/documentation-targets.make
(install-info,uninstall-info): Install into $(package_infodir).
Install images.  Run install-info to update dir.

* config.make.in (package_infodir): Add.

* Documentation/user/GNUmakefile (info-with-images,
local-install-info, local-uninstall-info): New target.