Updated scripts to install sdkit into existing installations, while still working with new installations

scripts/check_modules.py

@@ -0,0 +1,15 @@
+'''
+This script checks if the given modules exist
+'''
+
+import sys
+import pkgutil
+
+modules = sys.argv[1:]
+missing_modules = []
+for m in modules:
+    if pkgutil.find_loader(m) is None:
+        print('module', m, 'not found')
+        exit(1)
+
+print('ok')