warn user if python3 is used to run setup
Fix save log dialog freezing. Closes #3675.

Avoid using native dialog seems to solve the QFileDialog freezing when
qtreactor is used.
See more at: http://www.code-corner.de/?p=171
Update version
Images shuffle
Update intro
Update readme
* Read the docs
* Fix path to gpl image until we switch repos
Add install:bundle section.
Update checklist with symlinks info
Reformat links to downloads with symlinks
Revert repo names for the moment
Minor additions
Add pypi version icon in user/install
Fix README link to rtd