Logger.java: minor changes
CHANGED: cleaned logging when installation dir write protected
Removed old try-catch
Removed code duplication. Use only OSutils.browse
CHANGED: cleaned getMessage()S

 * converted log messages, which are calling logFoo(bar.getMessage(),
   bar) to use sane error messages
 * logFoo(baz, bar) will always print bar.toString() which contains
   bar.getMessage()