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No longer extract an abstract type `t` (private + ghost fields) as
`type t = unit`. Instead, extract `t` as a type with no definition.
On the other hand, if `t` is a non-private type which happens to
have only ghost fields, this is still extracted as `type t = unit`.

Extraction fixes

Closes #481 and #325

See merge request !364

Sort CE attributes in the output of the model parser

See merge request !378

The (eager) wildcard `.*` in the sed pattern wrecked havoc on some CE output. Also, the
removal seems no longer needed for ce-bench.

New input format "CFG" for control-flow graphs

See merge request !377