check for incomplete perl install when use requests parallel checkout

Panagiotis Iosif in https://lists.einsteintoolkit.org/pipermail/users/2023-May/008923.html encountered and issue when passed --parallel to GetComponents on a cluster where the Perl installation is very minimal and lacks Perl’s standard Thread package. This has happened before in some Docker image as well (so that now we include Perl as one of the packages to install with apt/yum/dnf).

Since this is apparently also an issue on clusters, pull request

https://github.com/gridaphobe/CRL/pull/13

provides an error message when this happens. Leaving out the explicit --parallel option lets one download the ET.

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