get rid of "minimize_timeout", now that there's an automatic adaptive timeout mechanism in "minimize"

added "max_relevant_per_iter" option to Sledgehammer

thank Andrei instead of Tanya

fix the relevance filter so that it ignores If, Ex1, Ball, Bex

tuning

reactivated -segprot options, just to make double-sure;

tuned Markup_Tree.+ : slightly more expensive version to rebuild rest avoids crash of RedBlack.scala:120 (version Scala 2.8.0), e.g. on the following input: ML {* fun f x = (x + 1, "aaa") *}

tuned;

tuned signature;

simplified Command.status again, reverting most of e5eed57913d0 (note that more complex information can be represented with full markup reports);

proper range for hyperlinks and tooltips, using original markup information;

tuned signature;