Update brian, nrn, nest, pynn

Author: pgleeson

omv/engines/getbrian2.py

@@ -5,7 +5,7 @@
 
 def install_brian2(version):
     if not version:
-        version = "2.7.1"
+        version = "2.9.0"
     try:
         pip_install("brian2", version)
         import brian2

omv/engines/getnest.py

@@ -8,7 +8,7 @@
 
 def install_nest(version):
     if not version:
-        version = "3.5"
+        version = "3.7"
 
     inform("Installing NEST", indent=2, verbosity=1)
     nestpath = os.path.join(os.environ["HOME"], "nest")

omv/engines/getnrn.py

@@ -10,7 +10,7 @@
 def install_neuron(version):
     if not version:
         if sys.version_info.major == 3:
-            version = "8.2.7"  # for pynn 0.11.0
+            version = "8.2.7"  
         else:
             version = "7.6"
 

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...