CollectionTables doesn't re-download expressions on sample name change

[robertcv]

When using CollectionTables.exp to download the expression matrix you get rows indexed by sample name. The problem is that we currently don't take sample name change into account when checking for expression versions. The result is that if you change sample names you get stuck with the older names as the change doesn't trigger a re-download.

Current hotfix: call CollectionTables.clear_cache() to clear the cache and force a re-download.
Long-term fix suggestion: add a list of sample names to the version hash.

[JureZmrzlikar]

Thanks for reporting, will fix.