removed debug output
added toolip for element delete button
fixed tooltip for table add row/column buttons
fixed search-bug (enter-button had no effect after search-window was closed)
fixed top chrome bug: it was possible to click "add new chart" even when it was disabled
 - new formula indicator icon (one that people recognize)
 - use plural for for hide/show row/col headers in German translation now
new feature: selected cells can be used as input for SUM, AVG, MIN, MAX and COUNT