httprepo: proper handling of invalid responses without content-type (
issue2019)
This can currently be tested on http://sf.net/
httprepo: use the original exception after falling back to static-http failed
Before the fine exception handling in httprepo was never shown.
The static-http exception will now only be shown when static-http is requested
explicitly.
unbundler: separate delta and header parsing
Add header parsing for changelog and manifest (currently no headers might
change for next-gen bundle).