GitLab

*velocity type changed ?
*velocity write
*comments

*deletion of existing devices at startup
*write value initialized at startup
*get_sub_devices replaced by get_devices_from_server

now controllers and axes are deleted when loading config
when adding an axis with the same name as an existing one, an AxisRef object is created
added "_update_refs()" to Controller class: this converts AxisRef objects to real Axis and updates tags
controller.tagged dictionary now contains Axis objects and not axis names

* added Measured_Position attribut
* try to set "set" value of position attribute
* fix %.3f attributs formats

Conflicts:
	emotion/controller.py

Conflicts:
	emotion/axis.py
	emotion/controller.py

Conflicts:
	emotion/axis.py
	emotion/controller.py

added slits controller
added tests

changed read_state to state
added test for setting position

Settings class automatically sends events when set