new version 0.6-alpha.
fixes:
 - fillcolor for whole textfield/comment
 - fixed bug in excel-cell library (unary +/- operator)
 - disabled axis label inputs for chart types not supporting axis
 - changed search-control behavior: X only clears input but searchbox stays open
 - changed search-control behavior: closing searchbox unhighlights search results
 - made popovers fixed on screen so they don't move when workspace is scrolled
 - put back old wording for "first row contains headers" --> question seems unprofessional
 - "first row contains headers" now unchecked per default