Bug Fixes For Accidentals, String And Finger Numbers

frethandfinger.js,
stringnumbers.js:
  Place string and finger numbers to right of dots on dotted notes
  and fix various bugs.

modifiercontext.js: bug fix in formatAccidentals, formatAccidentalsByY,
  formatStringNumbers and formatFretHandFingers. Change order in 
  preFormat to formatDots, formatFretHandFingers, formatAccidentals.
  
renderer.js: clean up format of drawDashedLines

flow.html,
stringnumber_tests.js: add new test for string and finger numbers