* Implement signals for deleted variables etc.
* Mode without implicit multiplication
* Sort out when small floats really are zero
* Sort out x^-y -- (1/3)/(x+y)=1/3(x+y) but 1/3(x+y)=1/(3x+3y)
* Quoted ")" in function
* Do not recalculate plot data when it has not changed
* Instant apply for all parameters in plot
* Plot-functions
* Replace pointers to unit when unit type has changed (a different object must be created)
* Sort out percentile and provide alternative methods
* Improve matrix editing
* Get rid of wget dependency
* Split up interface code

* More functions
* More units

* Separate library
* Increase support for non-glibc systems

* API documentation

* Better graphs/charts (do not use gnuplot)
* Script/code plugins for advanced functions
* Command line version
* Gnome/KDE applets
* QT version
