debug: added optional libraries for tracking leaks

requirements_debug.txt

@@ -0,0 +1,8 b''
+## special libraries we could extend the requirements.txt file with to add some
+## custom libraries useful for debug and memory tracing
+
+## uncomment inclusion of this file in requirements.txt run make generate-pkgs and nix-shell
+
+objgraph
+memory-profiler
+pympler

requirements.txt

@@ -43,3 +43,6 b' ipython==5.1.0'
 
 ## test related requirements
 -r requirements_test.txt
+
+## uncomment to add the debug libraries
+#-r requirements_debug.txt