Summary
- add reconstruction for the SMT solver veriT * * * Improved veriT reconstruction
- NEWS;
- activate E 2.5 for production use (see also 5d1a7b688f6d); rebuild component according to current "isabelle build_e" and PLATFORMS;
- clarified signature;
- clarified Executable.libraries_closure;
- dedicated module for toplevel target handling
- avoid _cmd suffix where no Isar command is involved
- replaced combinators by more conventional nesting pattern
- consolidated names and operations
- centralized case distinction for beginning and ending nested targets in one place