One cannout put webpage class fully into source code while
Qt need to generate MOC file (Qt dictionary) for class slots and signals

Probably, this qmake project can be replaced with cmake logic

* remove copy constructor and destructor
* provide methods docu

Method introduced in TDrawable, while this class responsible to fill all
kinds of context menus for objects

TBufferJSON does not lise std::list of menu items, need to be
investiagted later

Drawable will be responsible to fill context menu items and then 
correctly execute them

Each drawable will get uniquie id, which is delivered to the JS side.
Such id will be used to request different object properties 

* MethodBDT annotate gradboost

* MethodBDT remove binary reweighting for multiclass

* MethodBDT increase response scaling to match lit. for multiclass

See Jerome H. Freidman "Greedy Function Approximation: A Gradient
Boosting Machine" for details (p.1201).

* Fix gradboost response event weight

The response of the gradient boosting was calculated using
`sum(|y_ik|(1-|y_ik|)) * w^2` for each decision node region
where w is the event weight and y_ik is the pseudoresidual.

This fix changes the weighing to `sum(|y_ik|(1-|y_ik|)) * w`,
that is the first expression is weighted linearly per event.

Symptoms include heavy bias towards events with w >> 1 and
elimination of events with w << 1.

* clang-format

We often parse the output of commands to get certain system
information. This however fails as soon as the system locale changes
which results in cryptic errors where certain variables have the
wrong content on an otherwise perfectly fine working system.

This patch sets LANG=C from CMake to force all subprocesses that
we run to use the stable C locale that should prevent all those
errors in the future.

TInterface now checks that all column names are known (i.e. are
found in the data or are names of custom columns) before booking
actions via CreateAction (Histo*, Profile*, Fill, Min, Max, Mean).

It looks for column names that do not correspond to a TTree branch
or to a `Define`d column and returns them in a vector.

No need for these details to be public.

Otherwise everyone using ninja to build is lacking colors.