Update hxtorch to 2.0-rc7

packages/hxtorch/package.py

@@ -12,7 +12,7 @@ class Hxtorch(WafPackage):
     # This repo provides a waf binary used for the build below
     git      = "https://github.com/electronicvisions/pynn-brainscales.git"
 
-    version('2.0-rc6', branch='waf')
+    version('2.0-rc7', branch='waf')
 
     # PPU compiler dependencies
     depends_on('oppulance@2.0:')