Update remote neuronlistfh example

* after some reorganisation on flybrain server
Add ... to args of read.neuronlistfh to be passed to download.file

E.g. allows quiet downloads by passing quiet=TRUE.
WIP: update REAME for CRAN
Update description/news for v1.0
Use Sys.which() to avoid test error on Solaris

* solaris "which" does not return an error code when the executable cannot 
  be found
* Sys.which() looks after this difference in behaviour
* problem and solution brought to my attention by the inimitable Brian Ripley
Add more info about CMTK dependency to README.md
shorten startup message complaining about CMTK absence
minor description edits
Bump version to 1.0.1
Fix jefferislab.org url in DESCRIPTION
More installation details
Description polishing
Add a description including href for CMTK
Merge branch 'master' of https://github.com/jefferis/nat
Merge branch 'master' of https://github.com/ajdm/nat