Create v1.4.8.1.md

ReleaseNotes/v1.4.8.1.md

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+# v1.4.8.1
+## New features:
+
+  1. add new roofit variables  (`RooAbsReal`):  
+
+    useful e.g, for efficiency or phase/amplitude parameterization
+     - `Ostap::MoreRooFit::Benrstein`      
+     - `Ostap::MoreRooFit::Monotonic` 
+     - `Ostap::MoreRooFit::Convex` 
+     - `Ostap::MoreRooFit::ConvexOnly` 
+  1. More generic `Ostap::MoreRooFit::ShiftAndScale`
+  1. make a first try to add `evaluateBatch` for existing PDFs: no large gain is observed :-(
+  1. add `roofunc.py` & `funbasic.py`
+  1. add `FUNC`, `FUNC2` and `FUNC3` classes. Move some functionality from `PDF`
+  1. add `Fun1D`, `Fun2D`  and `Fun3D` wrappers 
+  1. update `efficiency.py`
+  1. reshuffle a bit the existins strustures
+  1. add operations and operators for `FUNC`, `FUNC2` and `FUNC3` objects 
+  1. improve baseclasess for functions and PDFs, add more operators/operations 
+  1. modify `roofuncs` avoiding the dangling references 
+  1. Add `Ostap::MoreRooFit::Id`
+  1. make use of `Ostap::MoreRoofit::Id` in `Fun(1,2,3)D`
+  1. exclude serialization in `test_fitting_models3_2D` for ROOT 6.18 & python3
+  1. remove duplication betwen `ostap/fitting/roofuncs` and `ostap/fitting/variables`
+  1. disable `pathos` for python_version<=3.7
+  1. change pickling for all `FUNC`-based objects
+
+## Backward incompatible changes
+
+## Bug fixes:  
+
+  1. fix `local_roofit.h`