removed requirement for NRNHOME to be on the path (if --build uses 'require') for example
removed requirement for NRNHOME to be on the path (if --build uses
'require') for example

tclose/PyPe9,tclose/PyPe9,CNS-OIST/PyPe9,CNS-OIST/PyPe9,CNS-OIST/PyPe9,tclose/PyPe9