Adaptive size of the bionics window

...as part of answer to #7103.

Screenshots:
![bio-1](https://cloud.githubusercontent.com/assets/5421954/2729201/bb78b4bc-c604-11e3-8908-12421511bf9b.png)
![bio-2](https://cloud.githubusercontent.com/assets/5421954/2729203/bb78edec-c604-11e3-9bf0-1221dd4d9e74.png)
![bio-3](https://cloud.githubusercontent.com/assets/5421954/2729204/bb79c8c0-c604-11e3-8e7d-3b442e1091ac.png)
![bio-4](https://cloud.githubusercontent.com/assets/5421954/2729202/bb78e478-c604-11e3-92e9-baf3e71d3fda.png)