This commit ensure that the context used by the `mis_report_widget`
widget RPC calls is correctly computed.

Previously using the `mis_analytic_domain` context key was useless
as not taken into account in the widget.

…ll-down

Prior to this commit the state of the searchModel was lost when navigating
back from a drill-down.

This commit uses the globalState in order to store and restore the state
of the searchModlel. The use of a SubEnv allows not having to pass props
up to the widget, which would have required overriding the renderer, the
compiler and field.