OCamlPro: provide installers - and scripts

[GitMensch]

I've just recognized https://get-superbol.com/software/ and guess superbol binaries will find an entry there later, too.

Mainly @lefessan - I suggest to:

• host an additional public repo with "auxiliary" code you use for GnuCOBOL
• add the scripts to create the installer packages there (there may be others in the future), this would also allow contributions
• add a script that creates GNU/Linux binaries (possibly .deb, .rpm - with dependencies setup, plus an additional binary package you may just extract to /opt/gnucobol to use it [this can be created by running configure --with-prefix=/opt/gnucobol --with-json=local --with-vbisam (you create the vbisam package the same way and distribute them together)]) and add those to the list

Add the summary lines from the output of cobcrun --verbose --version to each of the download's descriptions. Those are the last, for example:

GnuCOBOL 3.2.0 (Nov 16 2023 12:25:09), "10.2.1 20210110"
GMP 6.2.1, libxml2 2.9.10, cJSON 1.7.14, ncursesw 6.2.20201114, BDB 5.3.28

[GitMensch]

Rechecked https://get-superbol.com/software/gnucobol-windows-installer/; next to older packages there is no an AIO package with a reasonable details info. The binaries were built by someone named David, so maybe @ddeclerck; but the scripts/configs for the installer and the new additional tool gc-onfig (adjusting environment variables) are still not available.

Nonetheless I take the option to say that the AIO works quite good, also as a silent msi install. I'd like to know what "gcobc" is and how the additional gdb.exe (also including python support) compare to gdborig.exe

In any case I suggest to:

• allow gc-config to operate either GLOBAL or CURRENT USER
• allow user installs (not write to global environment vars, install under %LOCALAPPDATA%\Programs per default)
• add a "GnuCOBOL command prompt" to the start menu shortcuts (it may just opens cmd.exe and executes cobcrun --verbose --version; in general similar what cobenv.cmd is doing
• add an option to place this shortcut on the desktop (additional)
• add option to install documentation locally (I think the compressed static HTML output should be small, if not this could be another installer
• add an option to not install GixSQL
• add an option to not create any startmenu shortcuts
• add an option to install only the runtime (= no cobc/gcc/gdb/gixpp/gixsql, no dialect configs)
• document how the options may be used for silent installs
• provide an option to not tinker with the environment (in the easiest way that would need a cobenv.cmd as shipped with Arnold's / MSYS2 that would be started first; it could additionally check a file in %LOCALAPPDATA% - which may be written by gc-config - that contains the GCC compiler to use and adjusts the environment variables for the running session)

[GitMensch]

moved to the right (new) repository

[GitMensch]

... not planned here, but hopefully there