Test latest pynn

Author: pgleeson

omv/engines/getpynn.py

@@ -7,7 +7,7 @@
 
 def install_pynn(version=None):
     if not version:
-        version = "0.11.0"
+        version = "0.12.4"
 
     try:
         # pip_install('lazyarray')  # This should ideally be automatically installed with PyNN...