Remove stashr-related code in [.neuronlistfh
Add ability to load neuronlistfh from remote filehash object and store
remove all references to stashR in context of neuronlistfh

* also update examples to use Ashley's new RDS based remote fetching implementation
doc fixes
remove code implementing stashR download
only try and use a remote to fetch when one is actually enabled
STY: cleaner syntax for downloading object files
Don't allow a remote to be set for anything other than RDS backed neuronlistfh
Merge branch 'ajdm-feature/remoteneuronlistfh'

* ajdm-feature/remoteneuronlistfh:
  Don't allow a remote to be set for anything other than RDS backed neuronlistfh
  STY: cleaner syntax for downloading object files
  only try and use a remote to fetch when one is actually enabled
  remove code implementing stashR download
  doc fixes
  remove all references to stashR in context of neuronlistfh
  Add ability to load neuronlistfh from remote filehash object and store
  Remove stashr-related code in [.neuronlistfh