Update NEWS, README, and version numbers for the coming 0.17.3 release

Merge pull request tpaviot#384 from tpaviot/review/release-0.17.2

Set Version number to 0.17.2; update NEWS and README.md

Merge pull request tpaviot#365 from tpaviot/review/0.17.1-release

Review/0.17.1 release

Merge pull request tpaviot#306 from tpaviot/appveyor-fix

Appveyor fix for r0.17

Merge pull request tpaviot#270 from tpaviot/review/prepare-release-0.…

…16.5

Review/prepare release 0.16.5

Release 0.16.4 misc updates

Merge pull request tpaviot#121 from tpaviot/review/prepare-0.16.2

review/prepare 0.16.2

Merge pull request tpaviot#117 from tpaviot/review/prepare-pythonocc-…

…0.16.1

Review/prepare pythonocc 0.16.1

Merge pull request tpaviot#45 from tpaviot/review/release-0.16.0

review/release 0.16.0