Update GUI-Layout-Management.schelp

I added example about the question why a UserView might not show up in a Layout.
Disable AppNap in QtCollider, sclang, and scsynth
Add files I forgot to add in the initial commit.
Remove debug printf()s.
netbsd: use compile-time OS flag, in same places as freebsd - thanks Thomas Klausner
netbsd: Add missing header for strerror() - thanks Thomas Klausner
lang: use proper interface to get position within File - thanks Thomas Klausner
netbsd: avoid referring to QGtkStyle, not a public symbol - thanks Thomas Klausner
build rules: neater check for Linux-or-*BSD, thanks Tim Blechmann
Fix Scale.newFromKey with tuning argument

newFromKey was not copying the scale, which violates intent, and also
breaks usage of the 'tuning' argument which is read-only in the hardcoded
scales.
cmake: install help on non-apple systems
Merge pull request #1175 from timblechmann/topic/install_fix

cmake: install help on non-apple systems
cmake: link sclang with tlsf
Merge pull request #1177 from timblechmann/topic/fixes

cmake: link sclang with tlsf
cmake: fix typo

fixes #1181
Merge pull request #1182 from timblechmann/topic/fixes

cmake: fix typo
supernova: don't scare osx users by consumer-os
supernova: load plugins recursively

Signed-off-by: Tim Blechmann <tim@klingt.org>
cmake/apple: compile targets directly into the app bundle
cmake: fix win32 code path

Signed-off-by: Tim Blechmann <tim@klingt.org>