another unatomic commit... (surviving without always on wireless broadband luxury)

* editor is disabled during a run, but scrollbar should still be usable
* make error list more sensible
* highlight first error by default
* remove root element and heading from tree inspector
* remove numbering of the variable and function inspectors
* heading of tables now align left
* column sizes more same
* direction chooser fixes, generally more usability
* direction chooser canvas pimping + disabling of previous direction when 'direction' command selected

hope you like it -- especially have a look at the pimped 'direction chooser'.