SCHEDULESection with its special implementation is a remnant of older
design and largely unnecessary now. The implementation also relied on
shared_ptr for efficiency and was not really used at all.
SCHEDULESection now is no longer special, and uses the same
implementation as SUMMARY, RUNSPEC etc. The one thing that separated it,
looking up keywords within a timestep, was only used once and this
computation has been inlined in the function.
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