Attempt to further generalize the min/max optimization so that, if an appropriate index exists, it can be used by any aggregate query that contains only a single aggregate of the form max(colname) or min(colname) and does not contain a GROUP BY clause.

FossilOrigin-Name: 7280e14cd8f55896451847b432171e8750a07c81

• manifest[diff]
• manifest.uuid[diff]
• src/select.c[diff]
• test/minmax.test[diff]