Override staging deamon start command to get logs on hosts
Use subroutine to determine sfarea from hostname
Override log_dir to empty string to avoid confusion
Check that the log directory exists and is writable, using nfs to be visible from login nodes
use staging area for staging daemon logs
Update Changes; remove diagnostic
Check existence of logs before starting demons; use /export but allow /nfs for test
Improve readability of bash command generation
Merge in wtsi-npg devel
Merge pull request #144 from KateTaylor/move_staging_logs

Move staging daemon logs to staging area
Merge pull request #146 from wtsi-npg/devel

pull request from wtsi devel to master - release 76.3
Merge pull request #147 from wtsi-npg/master

Pull request from wtsi-npg master to devel (release 76.3)
backported changes from wtsi/devel; resolved conflict in Changes