Release of v2.2.15

Standalone executable using static linking (configure --enable-static)

Release of v2.2.9

improve stability of iteration

Release of v2.2.8

Fix wall function errors in log law mesh in sst model

Release of version 2.2.7

Details can be found in changelog in readme file and commit comment.

Release of version 2.2.6

Details can be found in changelog in readme file and commit comment.

Release of version 2.2.3

Details can be found in changelog in readme file and commit comment.