New 2.2 version

Written for Peg Solitaire by I. De Marchi on 2017-06-20

From 2017-06-19 is released the new 2.2 version.
News for 2.2 version:
- Improve the search for new solutions.
- Add 11 new problems to solve (343 in total).
- Added the suggestions of Andrej Mernik.
- Other minor changes and improvements.