Doc-de: update webpage
Doc-de: Update of learning manual
Doc-de: update notation manual
Doc-de: update notation manual 2
Doc-de: updates to notation manual 3
Add Bug meister Colin Hall, spell Marc Hohl correctly

Affects both release announcement and Documentation/included/authors.itexi
contributors: add David Nalesnik
news: add David Nalesnik to 2.16 announcement.
Doc-cs. Update of fundamental.itely.
Web-it: update
Doc-es: mark updated files, except texidocs.
Doc-es: mark updated texidoc files.
Web-es: update NEWS.
Merge branch 'translation' into stable/2.16
Update Esperanto PO from TP

From http://translationproject.org/domain/lilypond.html
Update Italian PO from TP

From http://translationproject.org/domain/lilypond.html
Doc-cs. Update of fundamental.itely.
Fix documentation build
Doc-fr: updates to 2.16 - Essay
Doc-fr: updates to 2.16 - Extending