Changed organization of cmake files

Cmake files were added into subdirectories.
diff --git a/python/CMakeLists.txt b/python/CMakeLists.txt
index df11c10..6947d8f 100644
--- a/python/CMakeLists.txt
+++ b/python/CMakeLists.txt
@@ -28,20 +28,13 @@
 ########################################################################
 # Install python sources
 ########################################################################
+add_subdirectory(misc_utils)
+add_subdirectory(receiver)
+add_subdirectory(demapping)
+
 GR_PYTHON_INSTALL(
     FILES
-    __init__.py
-    demapping/gsm_bcch_ccch_demapper.py
-    demapping/gsm_bcch_ccch_sdcch4_demapper.py
-    demapping/gsm_sdcch8_demapper.py
-    receiver/gsm_input.py
-    receiver/fcch_burst_tagger.py
-    receiver/sch_detector.py
-    receiver/fcch_detector.py
-    receiver/chirpz.py
-    misc_utils/arfcn.py
-    misc_utils/clock_offset_corrector_tagged.py
-    misc_utils/hier_block.py DESTINATION ${GR_PYTHON_DIR}/grgsm
+    __init__.py DESTINATION ${GR_PYTHON_DIR}/grgsm
 )
 
 ########################################################################