restored ISABELLE_OUTPUT etc -- still relevant at least for mira.py itself

tuned;

fixed mira.py (cf. fd50596bf78b)

more direct embedding of abstract thm values into the ML environment -- avoidance of repeated ML_Thms.the_thm(s) considerably reduces compilation time for Poly/ML 5.4.x;

more static antiquotations;

always show some timing information, to reduce the need for explicit -v;

some information for central Isabelle repository configuration;

reduced settings patching

removed obsolete configuration AFP_images

faster compilation of ML with antiquotations: static ML_context is bound once in auxiliary structure Isabelle;

simplified symbol matching;

further clarification of malformed symbols;

more liberal scanning of potentially malformed symbols;

vacuous execution after first malformed command;

clarified Command.range vs. Command.proper_range according to Scala version, which is potentially relevant for command status markup;

tuned markup;

tuned message;

clarified "bad" markup: proper body text, invent missing serial on Scala side (counting backwards);

reports with body text, not just markup;

fixed "double rev" bug that arose in situations where a % comment arose on the last line of a file without \n at the end

special code with lists no longer necessary, use sets

proper error prefixes;

more precise recover_quoted, recover_verbatim, recover_comment (cf. ML version) -- NB: context parsers expect explicit termination;

tuned message;

clarified Linear_Set.next/prev: check definedness;

merged

Improved complete lattice formalisation - no more index set.

merged

tuned proofs;

sneak message into "bad" markup as property -- to be displayed after YXML parsing;