Version 0.2.0:

* New fetures:
  * Support for 16-bit, 32-bit and 64-bit
    per channel images
  * Rigidity masks
  * Left-right/top-bottom balance

* Performace related:
  * Improved attached visibility maps
    management (lower memory requirements)
  * All internal buffers turned from
    double to float, improving both speed
    and memory requirements

* Documentation:
  * Reviewed manual and completed refence
  * Added man pages
