Fixed all hierarchical blocks in the project
by adding a hier_block class that solves incompatibility between GNU Radio >=3.7.9 and <=3.7.8
and inheriting all hierarchical blocks from it.
This commit fixes #135
diff --git a/python/__init__.py b/python/__init__.py
index 0c50bdb..247c040 100644
--- a/python/__init__.py
+++ b/python/__init__.py
@@ -46,12 +46,14 @@
 
 # import any pure python here
 
+from hier_block import hier_block
 from fcch_burst_tagger import fcch_burst_tagger
 from sch_detector import sch_detector
 from fcch_detector import fcch_detector
 from clock_offset_corrector import clock_offset_corrector
 from gsm_input import gsm_input
 from gsm_wideband_input import gsm_wideband_input
+
 import arfcn