* make hub.enableItem() private
* make hub.downloadLatest() private
* make getData() private
* make hub.disableItem() private
* make hub.downloadItem() private
* make hub.syncDir() private
* make hub.localSync() private; keep warnings in Hub struct (no need to call LocalSync to get them)
* no need to use NewRequest()
* download error messages
* cscli hub list: fix item stats
* Method item.HasSubItems() - avoid explicit type check
* cscli config restore: drop silent install, just call InstallItem
* no backpointer yet
* simplify GetItemByPath
* hub: sort version numbers by semver
* replace golang.org/x/mod/semver with github.com/Masterminds/semver/v3 (would not compare correctly)
* fix nil dereference with tainted items
* update tests for collections, postoverflows
* fix nil deref
* don't fallback to master if hub is not found, improve message
* explicit message for unknown version / tainted collections
* pkg/hubtest: lint (whitespace, empty lines)
* use existing function to sort keys
* lint
* cscli hubtest: set TZ=UTC
* dedup Coverage struct
* pre-compile regexps
* remove redundant type declarations or global vars
* unnecessary pointer type
* ParseIndex() as hub method, don't collect missing items since they are never used
* don't export hub.parseIndex(), hub.downloadIndex()
* Fix suggest functional tests
* comments
* non-empty SubItems() implies collections type
* use "slices" from stdlib
* No need to repeat author field in the index -- take it from the item key
* Refactor hub URL/branch configuration
* docker: using --force to implement $DISABLE (required for items in collections)
* use pointer receiver for consistency
