Added system call to remove the temporary directory <outdir>.txt" at the
end of report generation.
To replace the "OK" button by "Run" button, the originally used
"buttonBox" had to be replaced by plain pushButtons with custom buttons.
(buttomBox has specific buttons and "Run" isn't one of them).
Merge pull request #26 from sunithamisra/master

The "Ok" button now says "Run"