* 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()
* csconfig: drop redundant hub information on *Cfg structs
* rename validItemFileName() -> item.validPath()
* Methods on hub object
* updated tests to reduce need of csconfig.Config or global state