Proj upper level cache #614
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pramsey
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Move the Proj cache from the FunctionCallInfo that is limited to function lifetime, up to the backend process itself, so it lasts the length of a connection. Also update the constants/oid lookup helper infrastructure to work without needing a function call to drive locating the install location. Cache move should improve performance for people running projection transforms within PL/PgSQL functions, where the FunctionCallInfo only survives for the length of the PL call, not the length of the transaction.