View source for Control application

The main control application of Aquarium control implements the following features:

* [[Data acquisition of water temperature, pH and conductivity]]
* Data acquisition of ambient temperature and humidity
* Fresh water refill control
* Feed control
* Water temperature control using air ventilation
* Calculation of refill tank content based on [[water level measurement]] 
* Actuation of pump for water exchange

Additionally, the main control application implements the following supporting features:
* HW-Tests
* Text-To-Speech interface
* Logging
* Command interface to receive instructions from outside of the application
* Storage of recorded data in SQL database
* File-based communication to web application
* Recording of WebCam picture