-t parameter ignored if directory doesn't exist

If you do "srr -t <dir> ...", and <dir> doesn't exist, pyReScene silently ignores the parameter and uses the Windows temp directory instead (%TEMP%). I'd expect it to print an error about the directory not existing and exit.

This means that if the user typos the directory name, or forgets to create it, with a large reconstuction pyReScene could silently and unexpectedly cause the disk space on the OS disk to run out. It's fair to assume that if the user went to the trouble of supplying the -t parameter, they do NOT want the OS temp dir to be used.

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