improve new "sledgehammer_filter" action

remove useless var

added evaluation method for relevance filter

remove needless parameter

bring Sledgehammer's combinators in line with Metis's; cf. email from Larry

fiddle with the relevance filter

moved Toplevel.run_command to Pure/PIDE/document.ML; eliminated aliases of exception Toplevel.TERMINATE and Toplevel.EXCURSION_FAIL; tuned signatures;

Command.State: add reported positions to markup tree, according main message position or Markup.binding/entity/report occurrences in body; Position.Id_Range convenience;

tuned;

Node.full_index: allow command spans larger than block_size;

Document_View: repaint overview for any command change of this node (again);

refined proper_line_range (again), to make text_area_extension work with soft wwrap; NB: text_area.offsetToXY returns null for "invisible" positions;

Document state assignment indicates command change;

tuned commands_changed_actor: more precise/efficient handling of visible screen lines;

simplified/clarified Document_View.text_area_extension; tuned Document.Node.block_size, trading some space for better time;

Document.Node: significant speedup of command_range etc. via lazy full_index;

text_edits/recover_spans: reparse at least until line boundary -- increases chance of recovery for bad ML text, for example;

Command.newlines: account for physical newlines;

Toplevel.run_command: more careful treatment of interrupts stemming from nested multi-exceptions etc.; simplified Toplevel.error_msg;

tuned messages: discontinued spurious full-stops (messages are occasionally composed unexpectedly);

more careful treatment of nested multi-exceptions, collapsing cumulatively empty list to Interrupt;

tuned;

Command.results: ordered by serial number;

message serial number indicates physical order;

tuned;

tuned;

merged

what is hidden is hidden

hide all-too-popular constant name eq

merged