implemented \dot and \hat and \rblock and \center
removed old code
implemented space delimited commands \##, \eye, \okbox and \nokbox
cleaning
added getSize() method
fixed bug in constructor: global code variable has no more been set by
constructor.
fixed another bug:
formula image was static (in other words: shared between all formulas)
font size now passed to formula.image and formula.getSize
moved FormulaFont to separate class code file
FormulaFont now in separate class file,
overworked resizing
removed debug output