Don't display volume level in green
Use -O3 optimization instead of -Os
Disable thread safe operations with shared_ptr

This saves some time by making reference counting faster.  And it's
very compiler-specific.
Obtain display from $DISPLAY
Initialize keyboard info in getGroupCount()
Set status bar delimiter properties in main()
Simplify forbidding copy/assignment
Use delegating constructors in subclasses of Field
Add basic color scheme
Pass sound card name to Volume "widget"
Use std::tie in Volume::update()
Document configuration
Use EXIT_SUCCESS in main()
Update e-mail address
Make dzen2 command configurable in the Makefile
Fix memory information for recent Linux
Add debug build
Strip release executable
Remove Vim mode lines

Changed how I feel about it, not setting this kind of stuff
in one common file per project.
Fix header guards to follow letter of the standard

No user defined symbols (including preprocessor symbols) shall
start with more than one underscore.