Merge branch 'master' of https://github.com/Codra-Ingenierie-Informat…

…ique/plotpy

# Conflicts:
#	CHANGELOG.md

Replace deprecated icon files with new SVG icons for selection tools

Update CHANGELOG.md to include issue #32

Fix: downgrade version from 2.7.2 to 2.7.1 in __init__.py

Merge branch 'develop'

Bump plotpy version to 2.6.2