- unify multi-line expression alignment style.
- unify multi-line function call alignment style.
- simplify client moving on monitor count decrease.
- clarify comment for focusin().
- remove old confusing comment about input focus fix in focusmon(). The
  explanation is already in the old commit message, so no need to keep it in the
  code.
- remove old comment describing even older state of the code in focus().
- unify comment style.
- break up some long lines.
- fix some typos and grammar.

- better scaling for occupied tag squares.
- draw statusline first to omitt some complicated calculations.

True, False are X11-specific (int), make sure to use c99 stdbool for
program-specific things.

dmenu uses Xft now (soon to be released).