Summary
- tweaked Sledgehammer interaction
- there won't be an E version 2.7
- reverted 0506c3273814 -- the message is still useful
- compile
- adopt terminology suggested by Larry Paulson
- more robust E proof parsing
- avoid double 'Warning:' in Sledgehammer messages
- tweaked abduction in Sledgehammer
- slightly more documentation
- renamed new Sledgehammer option
- updated documentation
- improve ad hoc abduction in Sledgehammer
- tuning
- don't apply abduction and consistency checking to goals of the form 'False'
- implemented ad hoc abduction in Sledgehammer with E