minimal updated of jEdit/README.html, without any substantial reforms;

clarified notion of Command.proper_range (according to Token.is_proper), especially relevant for Active.try_replace_command, to avoid loosing subsequent comments accidentally;
reverted f3588e59aeaa accordingly;

avoid extra fork for fulfill_proof_future whenever possible -- without proof terms it merely doubles the number of proof tasks redundantly, by piggy-backing another 10 microseconds task;

report status more frequently on demand;

more efficient inlined properties, especially relevant for voluminous tasks trace;

more generous tracing limit, which is relevant for applications where this occurs routinely (e.g. HO unification trace);

repackaged polyml-5.5.0-1 -- only x86-cygwin changed;

better apply peflags at build time, to avoid antivirus getting nervous about changing executables;

Added tag Isabelle2013-RC1 for changeset 2c3d0cb151c0

updated for release;