prepare v1.4.5.0

ReleaseNotes/v1.4.5.0.md

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+# v1.4.5.0
+
+## New features:
+
+  1. Add new functions:
+       - `parameters`
+       - `parameter` ( and shortcut as `__getitem__` )
+     for the base class `PDF` to allow "easy" access to the values of 
+     parameters by name, e.g.  `a = pdf['A']` or `a = pdf.parameter('A')`
+  1. New function `mid_point` is added to `PDF`-base class, 
+     defined as 0.5*(x_low + x_high), where f(x_low)=f(x_high)=0.5 * f_max.
+     x_low and x_high  are the same points used for evaluation of FWHM.
+     It characterises the location of the peak, similar to `mode`, `median`,
+     `get_mean` and other related functions 
+  1. Add `ResoBukin` -  symmetric resolution function based on Bukin-pdf. 
+  1. Update `tests_fitting_resolutions.py` 
+  1. Add `Losev`-function&pdf - a kind of asymmetric hyperbolic secant function
+     - `Ostap::Math::Losev`
+     - `Ostap::Models::Losev`
+     - `ostap.fitting.signals.Losev_pdf`
+  1. tune `RooFitResult.table` printout method
+  1. update some fitting examples  
+  1. add option/property  `directory` for `ostap.parallel.task.Task` to indicate 
+      the directory where the job needs to be executed       
+  1. add option/property  `environment` for `ostap.parallel.task.Task` to 
+      setup   additional environmental variables (if needed)  
+  1. Add  argument `keys`  for the method `clone` for all databases, allowng to 
+     copy only certain keys into cloned database. (Default: copy all keys) 
+  1. add `json`, `gif` and `jpg` output formats for  default `canvas >> 'aaa'` operator
+  1. add `hadd` method for `ostap.trees.data_utils.Files` to merge ROOT file via `hadd` script
+
+
+## Backward incompatible changes
+
+  1. MASSIVE RENAME/FIX:  Apolonios -> Apollonios
+  1. Add `jobid` argument for `Task.process`
+      - All existing tasks are updated properly 
+      - All new functions and tasks must take this argument into account!
+
+
+## Bug fixes:  
+
+  1. Fix minor bug in `ResoBukin`-resolution function