Attach log file instead of appending it to description

If we don't have a log file we append the line "No log available" to
the description, otherwise we attach the log file to the jira issue.
Don't show reporter dialog on taskbar

On Linux the dialog shows up as question mark in the task bar, so we
either have to set a proper icon or not show it which is what I
decided to do.
Merge pull request #190 from ermshiperete/LogAsAttachment

 Attach log file instead of appending it to description