Allow value expressions to gain access to option settings.

For example, "ledger eval options.limit" prints 0 (for false), but:
"ledger -l hello eval options.limit" print "hello"s, since the value of
options.limit, once set to a value, is that string.  For flag options,
such as -Y, eval prints 0 if unset, and 1 if set.

This feature allows value expressions to be conditionalized based on the
presence of user options.

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