Such includes should not be accessible in the user codes

See https://root-forum.cern.ch/t/ld-library-path-is-ignored/38378
Fixes https://github.com/root-project/root/pull/4703/files#r366820344

also if configured with CMAKE_INSTALL_PREFIX, root.exe relies on LD_LIBRARY_PATH to find libRint etc (unless configured with RPATH).
This fixed root.exe not finding libRint from the install dir.

Use these arguments to re-assign ip address where bind notebook server.
Current notebook version may fail trying assign it too all available ips

Without DISPLAY, everything might work just fine because no
TGClient is needed. But then do not spoil the party by trying
to display the popup!

This is pointless / almost never works, and is often done too eagerly.
Instead, let the TGClient do it (through TSystem) when actually needed.
The complaint about ssh -Y is moved there, so remove it here.

Implement an "argparse" unique description of man pages and usage for root commands. 

This reverts commit dc825fc4.

* Centralise the generation of help for root command

Add argparse2help.py, add root-argparse.py, delete the old help of root, add the cmake commands needed to generate the header containing the command line options help and to generate manual page for the root command.

The python file argparse2help.py can be called with the root-argparse.py and the output name as arguments. This call will generate the header file if the output has an extension ".h" and will generate the manual page if the extension is ".1"

* Centralise the generation of help for the rest of the commands

Add cmake changes to generate headers and manual pages for rootcling hadd and hist2workspace
Delete old man pages of hadd and hist2workspace
Add commented out generation of man pages for python commands, we need to add a dependency before uncommenting them out
Add hadd rootcling hist2workspace argparse modules

* make the path compatible with windows

* review modifications

* add dependency on the input and the generation script of man pages

* remove installation of headers

* Update CMakeLists.txt

It makes no sense to generates man pages on Windows. Windows does not have the `man` command.

* Update argparse2help.py

* Update argparse2help.py

* Update argparse2help.py

* Update hadd.cxx

haddCommandLineOptionsHelp.h was not included for windows

* Update root-argparse.py

add the option --version

* Update argparse2help.py

simplified version (Thanks Bertrand !)

They are meant to be identical but diverged.

This reverts commit 5c076c6c.

This reverts commit b406328d, reversing
changes made to 318c7a47.

Make cannot deal with 'export *', they have to be escaped and fixed later on.

This is the recommended way of using the modules feature and should pave our way
of enabling -fmodules-local-submodules-visibility mode.

There are still some issues when building the C++ modules implicitly from ObjC++
context.

Our two build systems can generate almost entirely a modulemap file laying out
one module per library. Due to some non-modular implementation in ROOT's core we
still need to treat some header files specially.

This patch appends modular header files to the modulemap while skipping the
predefined ones. Configure-make relates all headers that are installed in
$ROOTSYS/include to their library whereas relates only headers which are part of
library's dictionary.

Use SFINAE instead to select the right utmp[x] member function.