* Implement signals for deleted variables etc.
* Sort out when small floats really are zero due to limited precision
* Quoted ")" in function
* Plot-functions
* Replace pointers to unit when unit type has changed (a different object must be created)
* Sort out percentile and provide alternative methods

* More functions
* More units

* Increase support for non-glibc systems

* Sane and stable API

* Script/code plugins for advanced functions