- cython: raw_meat: add/adjust getter method

- implement full app example in pyt/example.py
	- merges time series of all consistent channels
	- extract them into pyarrow table
	- save pyarrow table as compressed parquet file

lib/rawmerge.hpp

@@ -39,7 +39,7 @@ public:
   raw_merger(std::string rawfile): raw_eater(rawfile)
   {
     // add first initial channel
-    this->add_channel(rawfile);
+    //this->add_channel(rawfile);
   }
 
   raw_merger(): raw_eater()