Calculatorview is responsible for creating and maintaining the
graphical perspective for the calculator module. It uses the sans.dataloader
and sans.guiframe packages, as well as the sans.calculator and Matplotlib
packages for the mathematical components. 
It provides the following tools:
- SLD Calculator
- Kiessing Calculator
- Resolution Calculator
- Slit Length Calculator


Others packages dependencies are the following:
- wxPython
- periodictable