allow flair correct to specify temporary directory

[diekhans]

flair_correct.py does not allow for specifying the temporary directory it uses. On many HPC systems, one wants to put tmp files on the local disk, but the run and final output on global storage can be much faster.

Also, honoring the TMPDIR env var would be better behaved.

       # make temp dir for dumping                                                                          
        tempDirName = str(uuid.uuid4())
        try:
                current_directory = os.getcwd()
                tempDir = os.path.join(current_directory, tempDirName)
                os.mkdir(tempDir)
        except OSError:
                print("Creation of the directory %s failed" % tempDirName)
                sys.exit(1)

[diekhans]

Also, flair correct removes the contents of the temporary directory, but not the directory itsekf.