Add syntax error highlighting on run.
Merge pull request #38 from PencilCode/syntaxerror

Add syntax error highlighting on run.
Add a stop button.

Turtle animations can now be stopped.  When running a program
that supports $.turtle.interrupt, the IDE now polls (every 0.1 sec)
$.turtle.interrupt('test') and shows a stop button when true.

Clicking on the stop button injects an interrupt() call into the
running program, stopping animation.
Merge pull request #39 from PencilCode/stopbutton

Add a stop button.
Bowercopy update.
Merge branch 'master' into geomshow

* master:
  Bowercopy update.
  Add a stop button.
  Add syntax error highlighting on run.

Conflicts:
	site/top/src/editor-debug.js
Working orange arrow tracing.