* imc_channel, imc_raw: optimize with pass by reference

* imc_object: asc_time, localtime: make threadsafe
* imc_datatype: satisfy 'rule of two'
* python: remove all unused imports

parquet/parquet/generate_make.py

@@ -1,6 +1,5 @@
 #-----------------------------------------------------------------------------#
 
-import glob
 from pathlib import Path
 
 # find source files