gitignore and cleanup in the mCBM2021 macro folder
- Add general git ignore filter for all_XXXX.par files in all mcbm macro folders until 2099 (original idea by @karpushkin_AT_inr.ru
- Same for core dumps created when segfault in "bash" ROOT session
- Same for PDF files
- Add gitignore for private ROOT settings in mcbm2021 folder
- Remove existing private ROOT config in mcbm2021 folder