Correctly detect python in PATH
Merge pull request #1955 from paolo-sz/master

Correctly detect python in PATH
Fix heap-buffer-overrun in PropertiesWidget::displayFilesListMenu
Merge pull request #1983 from sorokin/buffer-overrun-prop-widget

Fix heap-buffer-overrun in PropertiesWidget::displayFilesListMenu
Change the program updater's URL for Windows and Mac OS X. Closes #1954.