Continuation Core and Toolboxes (COCO) Code

temporary: small workaround problem with initial points on boundary

- added algorithm for multi-valued events
- we can now specify a function as event name,
this function is used for communicating actions
to be taken on event groups (event handler)
- moved computation of initial point to cover1d
- added check that initial point is interior point
- modified example coneA to illustrate multi-valued
events and reverse communication via event handler

Fix typos in event location warnings

evidx was unknown: changed to opts.cont.events.evidx. Also corrected function
names.