af4a04eae07184f7437a8c51858a4ddb8a2e3e4c

For now, just validate new pointcache names as if they were filnames. Ideal solution would be rather to validate names in `ptcache_filename()`, but it would likely break some existing caches - and we'd also have to ensure we still have uniqueness of name after it has been cleaned up, wich would not be trivial at this stage. So let's go for simple solution for now, especially since this part of code is to be fully rewritten in 2.8...
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