v1.9.6.0

v1.9.6.0

New features:

1. add get_env and has_env functions to ostap/utils/basic.py to check/access environment variables in case-insensititve way
2. make use of get_env and has_env functions alsmost everywhere insted of os.environ
3. small reshuffle of code between ostap.core.core and ostap.utils.basic
4. first step towards usage of ipyparallel for parallel processing: ad trivial test test_parallel_ipyparallel.py
5. make use of ipyparallel parallelisation
6. add Ostap::Math;:agm and Ostap::Math::ghm fuctions
7. improve ostap/parallel/parallel_ipyparallel.py
8. improve printout from ostap/core/config.py
9. add $OSTAPDIR/.ostaprc in the list of configuraiton files for processing
10. provide $OSTAPDIR/.ostaprc configuration file
11. more reshuffling of the code for generic and specific parallelisation
12. more polishing for the updated configuration
13. more polishing for the configuration

Backward incompatible:

1. rename Parallel section in configiration files into Pathos
2. rename and move some pathos specific code from ostap/parallel/utils.py to ostap/parallel/pathos.py

Bug fixes: