Test version for issue 293

This test release attempts to solve issue 293. The following text has been added to the documentation:

The Apache POI library is used for generating the scan report in Excel format. This library creates its own directory for temporary files in the system temporary directory. In issue 293 it has been reported that this can cause problems in a multi-user environment, when multiple user attempt to create this directory with too restrictive permissions (read-only for other users). WhiteRabbit from version 0.10.9 attempts to circumvent this automatically, but this workaround can fail due to concurrency problems. If you want to prevent this from happening entirely , you can set either the environment variable ORG_OHDSI_WHITERABBIT_POI_TMPDIR or the Java system property org.ohdsi.whiterabbit.poi.tmpdir to a temporary directory of your choice when starting WhiteRabbit (best would be to add this to the whiteRabbit or whiteRabbit.bat script). Please note that this directory should exist before your start WhiteRabbit, and that it should be writable by any user that may want to run WhiteRabbit. For each user a separate subdirectory will be created, so that permission related conflicts should be avoided. Also, WhiteRabbit now attempts to detect this situation before the scan starts. If this is detected, the scan is not started, and the problem identified before the scan, instead of afterwards.