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)

It is possible to execute the watchdog command of dbmngr module in a Nagios plugin compatible way, which enables users to monitor health of the system and database via Nagios. The command was also renamed to watchdog-events to enable adding additional watchdog commands. (Redmine issue: #3383)

* 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