usermanual: it's film roll instead of filmroll
Merge branch 'master' of ssh://github.com/darktable-org/darktable
GTK3: Do not use deprecated symbols. Part 1/2: GTK

Over the years, a number of functions, and in some cases, entire widgets have been deprecated.
These deprecations are clearly spelled out in the API reference, with hints about the recommended replacements.
The API reference for GTK+ 2 also includes an index of all deprecated symbols.

In this part, only GTK deprecated functions are disabled (-DGTK_DISABLE_DEPRECATED -Werror=implicit-function-declaration)

See https://developer.gnome.org/gtk3/3.9/gtk-migrating-2-to-3.html#id-1.6.3.3.4
lua : add internal lua implementation

this is a fallback if no system lua is found.
lua can still be entirely disabled at cmake time
lua: add a message on lua start

this is a temporary feature to help packager test that lua works correctly

feel free to revert this commit before release
Replace with appropriate widgets.
Merge pull request #301 from LebedevRI/gtk3-02-do-not-use-deprecated-symbols-part-1-of-2

GTK3: Do not use deprecated symbols. Part 1/2: GTK