Preparing for 1.9.7 release

fixed warnings detected by clang

Preparing for release 1.9.5

Preparing for release 1.9.4

Preparing v1.9.3

Preparing v1.9.2 release

clean history

Fixed Delaunay.psm (atomics.h no longer exists since we use std::atomic)

Fixed the PSMs (there was a bit of adaptation to do with the new

thread sync based on std::atomic)

preparing for v1.8.8 (a bit soon for a new release, but needed to pat…

…ch thick lines bug)