Temporary directory can be erased while running

[ctribes]

The default directory to write the input files and run the blackbox in batch mode is /tmp. This directory can be erased automatically. This leads to message like

problem with input file /tmp/nomadtmp.18096.0 Warning: Evaluation error with point #640 ( 220 20 0 100 ) Evaluation error : output is empty

The default temporary directory will be "./" in the next release. To force this behaviour with the version 4.2.0, set TMP_DIR ./