Importing several SIMEVENTS files together now merges them into one document
before coalescing, so keyword events with the same owner, type and timestamp
are combined across files, not only within one file.
- Add merge_simulator_events_documents, parse_simulator_events_files and
apply_simulator_events_files. Source locations carry the file name, so
conflict warnings and errors identify both files.
- Reject mismatched UNIT, and a second RESTART or duplicate WELSPECS across
files. Collect parse errors from all files in one pass.
- Warn when files declare the same FILTER name with different expressions,
and keep each file's filter instead of reusing the first one.
- CLI accepts multiple files; the import dialog allows multi-selection.