Added conda info in README

report warnings to end users, fix #60

python: allow loading of multiple robots

RobotLoader

Remove lights from Anymal robot

python: fix double negative

[Talos] fix collision shape of the ankle

Fix Hyq srdf (disable collision pairs)

And activate tests again

add talos full

to avoid a dependency to https://github.com/stack-of-tasks/talos-data/
in many packages

[Python] add more paths to getModelPath, fix #37

and document their purpose