Doc-fr: reflects Issue 4034: Fix some broken commit references.
Doc-fr: updates with latest merge

 - EM programming-interface
 - NR keyboards
      notation-appendices
      spacing
 - web-intro
Doc-fr: update texidocs
Issue 4065: Don't rescale \layout in \score markup when already scaled

This change modifies the fix for issue 677 to avoid scaling problems
when employing $(ly:grob-layout grob) in the \layout of a score markup.
Issue 4055: Factor out typecheck_grob routine.
Issue 4057: Create Context::here_defined as faster variant of Context::where_defined
Use Context::here_defined to speed up some operations
Issue 4056: Let \partial in mid-piece work via a finalization hook

That allows all other processing to complete before measurePosition is
adjusted.  In particular, this avoids problems when multiple parallel
contexts invoke \partial and/or bar checks.
Regtest for \partial in mid-piece
Issue 4051: Improve make-countdown-announcement.sh.

* Check for tracker issues missing OWNER or SUMMARY fields.
* Convert tabs to spaces in tracker issue summaries.
* Add lilypond-issues.csv to .gitignore.
* Add Heikki to mailmap.
* Update documentation.
* Fix typos.
Merge branch 'master' of /home/jcharles/GIT/Lily/. into translation
Doc-fr: updates committishes for full sync