(Redmine issue: #7632)

Previously the Makefile wrongly expected the appropriate configuration in SSH`s
config file.

(Redmine issue: #7041,#7548)

(Redmine issue: #7041)

(Redmine issue: #7041)

Untested.

(Redmine issue: #7041)

(Redmine issue: #7041)

(Redmine issue: #7041)

(Redmine issue: #7041)

(Redmine issue: #7041)

(Redmine issue: #7041)

(Redmine issue: #7041)

(Redmine issue: #7041)

(Redmine issue: #7041)

(Redmine issue: #7041)

(Redmine issue: #7041)

(Redmine issue: #7041)

(Redmine issue: #7041)

(Redmine issue: #7041)

Original idea wa to use Docker for this purpose, but it turned out full
featured virtual server will be much better suited for this task due to
the comlexity of the whole environment.

(Redmine issue: #7041)

(Redmine issue: #1017)

(Redmine issue: #3443)

(Redmine issue: #6222)

(Redmine issue: #3443)

It is much better approach to leave all geoipupdate related stuff outside of the Mentat package a let administrator to install geolocation databases himself. Documentation was updated accordingly. (Redmine issue: #6157)

MaxMind service changed its policy for downloading its free IP databases. This commit features necessary test code and configuration changes to make GeoIP enrichment plugin working again. There will be also documentation update to reflect necessary steps for upgrading, once these are finetuned. (Redmine issue: #6157)

Developer may now override default values 'python3' and 'venv' when installing local virtual environment to install additional venvs for testing and development purposes. (Redmine issue: #1017)

After creating fresh virtual environment the 'pip' and 'wheel' packages inside this venv will be upgraded to latest versions. (Redmine issue: #3387)

(Redmine issue: #5751)

(Redmine issue: #5101)

Because message catalogs can be updated with different commands (with makefile during development and with hawat-cli utility when installed from Debian package), the information about source location can result in unnecessary changes. This patch removes these locations to fix this issue, but in the future it would be better to come up with different solution. I have not implemented that right now, because there is another version of mentat-reporter.py behing the horizon, which merges Hawat`s and Mentat`s message catalogs. (Redmine issue: #4789)

The makefile target 'develop' now pre-builds web interface artifacts. There is a new example configuration file for Apache2 that demonstrates the necessary configuration for Git installations. There is a custom WSGI script file for easier web interface installation from Git. (Redmine issue: #4216)

The installation manual was enhanced with the option of installing the project directly from Git repository. This option overlaps with the installation process for local development, so the development documentation page was also updated accordingly. (Redmine issue: #4216)

(Redmine issue: #3387)

New mechanism for building Debian packages makes better use of debhelper. Previous solution with using Grunt for building the package was abandoned entirely. (Redmine issue: #3387,#4216)

(Redmine issue: #3387,#4216)

* The creation of Python virtual environment is now a separate makefile target.
* The 'develop' target now reuses already defined targets.
* Using python-dotenv to local configuration customizations.

(Redmine issue: #3387,#4216)

This version comes with improved application command line parameter documentation, some changes were necessary to make everything work again. (Redmine issue: #3387,#3361)

(Redmine issue: #3387)