Extcalc v0.9.1 available

Extcalc is a multifunctional scientific graphic calculator for linux with features like graph drawing, graph analysis and calculating scientific functions including differentiation, integration and logic functions.

The second beta release comes with some improved functions and new features.
The changes mainly affect graph drawing, help, internationalization and the user interface.

Logic expressions and script commands can be used to draw graphs and functions for
graph drawing can be exported an imported.
A list with constants and conversation factors has been added.