Allow enabling/disable of gnome shell status icon.

Signed-off-by: Rob Caelers <rob.caelers@gmail.com>
Update news

Signed-off-by: Rob Caelers <rob.caelers@gmail.com>
Merge branch 'improve_lock_and_suspend' of https://github.com/matjon/workrave-1
Fix compilation on Win32.

Signed-off-by: Rob Caelers <rob.caelers@gmail.com>
A fix for GTK2
Integrated locking the screen into the shutdown pull down menu

at the Break Screen.
Idea by Ray Satiro.
Moved the lock combo box to the left

relative to the skip and postpone buttons.
Renamed BreakWindow::create_break_buttons to create_bottom_box

The new name better reflects the content of this box.
Removed all *.m4 files from Git

It is unneccessary to keep them in Git because they are can be recreated
by ./autogen.sh.

Additionally, ./autogen.sh sometimes puts in /m4 other versions of these
files than are stored in Git. That can get quite annoying because git
checkout -f (or switching branches / commits) gets back these files,
forcing to do a more lengthy build.

The m4/ directory is placed in .gitignore which supports the fact that
these files are not needed.

This fixes #1152.