Refactoring to at least get working home page.

(Redmine issue: #7544)

(Redmine issue: #7041)

(Redmine issue: #7041)

The auth_dev authentication module was accidentaly enabled by default in configuration file shipped with Mentat packages. It was changed at some point locally during development and the change was accidentally committed. The documentation was missing the warning about disabling it during installation in production deployment. This is fixed now.

This patch contains following features:

* Mentat service for accessing NERD database via RESTfull API.
* Prototype of pluggable for Hawat providing simple demonstrational view for searching NERD database and context search action menu item for searching IP addressess.
*

(Redmine issue: #5067)

This commit brings in considerable amount of work. When working on this issue everything was so tied together, that I have abandoned all attempts to split it into multiple commits. There are following changes and more:

* Implementation of lightweight chroot for containing the application in single directory tree.
* Design changes in scripts and daemons to implement the lightweight chroot.
* Many configuration file changes to make everything work properly.
* Makefile additions, new targets related to running
* Updated development documentation page.

(Redmine issue: #4216)

This was done to better decouple the library code. I have also added logging of subject and recipients for each email and added makefile target for launching development mail server. (Redmine issue: #3443)

Currently only built-in Flask commands run, shell, etc. are available. It can be used to launch development web server, which is now documented in development documentation page. (Redmine issue: #4216)