Bump version for development
fix download of remote neuronlistfh x2 without objects

* Ashley noticed this problem with flycircuit tests
* issue is that if we have downloaded it once, the new behaviour of 
  read.neuronlistfh assumes that the db directory already exists when
  we read the cached local copy from disk
* just decided to make the data directory on download
* add a test for this fix
doc: read.neuronlistfh creates data dir on download
Merge branch 'fix/neuronlistfh-redownload'

* fix/neuronlistfh-redownload:
  doc: read.neuronlistfh creates data dir on download
  fix download of remote neuronlistfh x2 without objects
Bump version 1.4.2