Checks if the package has permission to track usage.
Permission can be granted or revoked with
disableScimap() from the interactive prompt.
If permission is not given, the
returns silently without doing anything. If permission is
granted, the package sends usage information, but also
Tracking is automatically disabled if the environment variable R_TESTS is set (even to ""); this prevents spurious packets from being sent during testing. It's also disabled while packages are being installed (by checking for the environment variable R_PACKAGE_NAME).
See your usage and others' at http://scisoft-net-map.isri.cmu.edu
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## Type this in interactive mode to see whether ## the scimapClient package is enabled to collect usage data. isEnabledScimap() # returns TRUE or FALSE