support for semantic completion on Scala side;

clarified module location (again, see 763d35697338);

support for completion within the formal context; tuned signature;

removed remains of old experiment (see b933142e02d0);

removed dead code; more complete patterns;

tuned signature;

NEWS;

tuned comment;

refined language context: antiquotes; support default completions, with move of caret position; tuned signature;

tuned proofs;

merged

more standard theory name;

tuned;

tuned whitespace; tuned names;

proper ML structure with signature;

reduced ML warnings;

simultaneous mapping of strongly connected components

dropped dead code

more symbols;

merged

improved completion based on context information;

more markup -- complete symbols within antiquotation, notably with broken arguments;

eliminated somewhat pointless elements index (see also f793dd5d84b2, 2b7fed8c9c4ac): less memory and more speed (avoid linear "exists" of 19dffae33cde);

tuned signature -- avoid redundancy and confusion of flags;