(Redmine issue: #7041)

(Redmine issue: #5101)

Descriptions of common parameters should be in the documentation, so that the updates do not have to be done on so many places. Additional documentation should be present only for script/daemon specific parameters. (Redmine issue: #3387)

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)

(Redmine issue: #4307)

Feature: Added event reporting statistics to mentat-informant.py and done big overhaul of the whole module.

The mentat-informant.py module was redesigned to the liking of mentat-reporter.py module in terms of configuration options and general code design. The event reporting statistics section was added to the report emails to inform recipients, well, about event reporting statistics. (Redmine issue: #3377)

This patch attempts to make installation of Mentat system as simple as possible by improving the default configuration and cron files for each of the Mentat modules. The goal is to have most of the system up and running after the installation with as less configuration changes as possible. There are however some things that can not be configured in advance, for example email addresses for various reporting, so these are all directed to the local root. (Redmine issue: #3387)

* Added support for default admin contact, which can be used for redirecting emails to administrators.
* Added support for test mode, in which case the all emails are force redirected to admin emails instead of original recipients. This feature can be used for development or testing purposes.

The mentat-informant.py module is a Python replacement for previous mentat-briefer.py module. It is designed to provide periodical statistical overviews via email. The email reports are localized using babel package and can be translated into any language. Additionally, the reporting engine uses Jinja2 templating system for message rendering, so it enables very easy customization. (Redmine issue: #3377)

* the watchdog time interval is now configurable
* improved content of watchdog email alert
* improved module documentation

(Redmine issue: #3383)

Migration, refactoring and code style unification to support latest PyZenKit and Pynspect libraries.

This huge update represents a lot of work on many parts of the system. After major upgrade in PyZenKit and Pynspect libraries it was necessary to bring this project up to date. There were many changes in the code, lot of refactoring and while all this was done, code quality was improved, documentation written and unit tests modified. Many of these changes simply make sure, that the code works with latest versions of both libraries. This commit is supposed to be a single major feature upgrade, after this only smaller commits will follow to polish this huge amount of work.

(Redmine issues: #3374, #1017, #3361, #3387, #3443)

This is the initial project release. It works, however it should still be considered as alpha release and work in progress. Couple of known issues:
* missing configuration validation
* missing documentation
* missing modules
* only partially working unit tests, not enough coverge of unit tests