+ * added support for mouse scroll wheel (caused buggy behaviour before)
+ * added support for scrolling horizontal scrollbars with mouse wheel by
+ holding "Ctrl" button pressed while scrolling the wheel
+ * changed output file "stderr.txt" on Windows platform now always to be
+ created in the R'n'D sub-directory of the personal documents directory
+ * added Windows message box to direct to "stderr.txt" after error aborts