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- add support for proof-tree displays (currently Coq only)
- new file generic/proof-tree.el contains generic code
- Coq specific code has been added to coq/coq.el
Changes to existing Proof General functions:
- proof-shell-exec-loop and proof-shell-filter-manage-output call
proof-tree display functions, when the proof-tree display is on
- proof-shell-exec-loop returns t if proof-action-list is empty
_or_ contains only items for updating the proof-tree
- proof-shell-should-be-silent returns nil when the proof-tree
display is on
- coq-last-prompt-info, coq-last-prompt-info-safe return as
additional 4th element the name of the current proof
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