[PyROOT exp] long does not exist anymore in Python3, map to int

[PyROOT exp] Clear error indicator for fallback (enforced since py3.6)

[PyROOT] Use Python/C API utility for warnings

[PyROOT exp] Dont set error indicator during fetching keyword

Moved README.md added with Multiple Engines development in README.multiple.md and added a new README.md (Md version of the Drupal VMC main page)

Moved TPDGCode.h (used in 'pythia6' and 'pythia8') from 'vmc' to to 'eg'; this makes all other libraries in 'montecarlo' not dependent on 'vmc'

Useful when dumped data can be analyzed with normal text viewer.

Can be useful when RWebWindow data damped to the files

Both weak_ptr and shared_ptr are not working, 
therefore plain pointer for attributes I/O should be used 

Keep dotted string, not vector, which makes name management much more lightweight.
Introduce typed strings, to distinguish full paths ("hist.line.color") from just the final element ("color").
Rename AsOption to FromOption, which is more meaningful when reading the invocation.

Instead of holding all values (99% of which are defaults) in memory,
with each option, only store those that are customized. For, and
because reading is rare, store them as strings, which makes passing
them to the JavaScript side trivial.

Getters need to query the style - which is way more expensive than
reading a simple int. But this is also a fairly rare operation.

Implement new attributes for line, box etc.

[PyROOT exp] Move implementation of DeclareGenericCallable to separate source file

[PyROOT exp] Add feature to jit Python callable using numba

So far, the jitting is only supported for basic types.

[PyROOT exp] Add proxy class to switch between numba and generic impl

[PyROOT exp] Ensure no leaking PyObject if stepping out early in callable proxy

[PyROOT exp] Allow user to pass optional name of wrapper function

[PyROOT exp] Add test for dispatcher of wrapper functions

[PyROOT exp] Put in first round of comment

 - numba_only, generic_only and verbose flag
 - put only one decorator
 - change namespace of C++ side functions
 - modularize code
 - adapt tests

[PyROOT exp] Add missing DECREFs when stepping out due to an exception

[PyROOT exp] Remove unnecessary import of headers

[PyROOT exp] Make verbose=True to new default

Was not handled as map object, producing completely wrong output

TDirectory is the intended level to introduce this (i.e. along side Get and GetObject).

We need to cut a version thereof in TDirectoryFile otherwise the regular Get override
will hide the templated version

It is the same exact declaration and implementation as TDirectory::GetObject.

otherwise there is a risk of overcommiting the machine with too many workers.

Signed-off-by: Vassil Vassilev <v.g.vassilev@gmail.com>

This is preferred way, while correctly handles object ownership

Fixing:  warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘std::size_t {aka unsigned int}’ [-Wformat=]

One requires appropriate search method to found primitive and pad to
which it belong

When JS-side renders such objects, NDC position is calculated.
Now this position applied back to the server to preserve it.

Object will be referenced from client and updated correspondently