px_process_params: fix scope when script is called from repo root

If called with ./Tools/px_process_params.py, the path would start with
src/<module>, and thus not match the regex "^.*/src/"

Tools/px4params/srcscanner.py

@@ -34,7 +34,7 @@ class SourceScanner(object):
         Scans provided file and passes its contents to the parser using
         parser.Parse method.
         """
-        prefix = "^.*" + os.path.sep + "src" + os.path.sep
+        prefix = "^(|.*" + os.path.sep + ")src" + os.path.sep
         scope = re.sub(prefix.replace("\\", "/"), "", os.path.dirname(os.path.relpath(path)).replace("\\", "/"))
 
         with codecs.open(path, 'r', 'utf-8') as f:

Tools/px_process_params.py

 #!/usr/bin/env python
 ############################################################################
 #
-#   Copyright (C) 2013-2014 PX4 Development Team. All rights reserved.
+#   Copyright (C) 2013-2017 PX4 Development Team. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
@@ -41,6 +41,7 @@
 # Currently supported formats are:
 #   * XML for the parametric UI generator
 #   * Human-readable description in DokuWiki page format
+#   * Human-readable description in Markdown page format for the PX4 dev guide
 #
 # This tool also allows to automatically upload the human-readable version
 # to the DokuWiki installation via XML-RPC.