Add include_welsegs and include_compsegs flags (default True, preserving
current behaviour) to the schedule-generation API. Plumbed through
RimcWellEventTimeline_generateSchedule -> RicScheduleDataGenerator ->
generateMswForWell, gating only the WELSEGS / COMPSEGS merge calls.
WSEGVALV and WSEGAICD are unaffected.
Python: generate_schedule_text gains include_welsegs / include_compsegs
keyword arguments that forward to generate_schedule. Callers wanting
control-only / well-header-only schedule updates can now suppress the
verbose MSW table blocks.