Oid resolve of array datatype in prepared statements

[bjne]

It is currently not possible to use for example "text[]" as a datatype in prepared statements.

HeapTuple typetup = typenameType(NULL, makeTypeNameFromNameList(namelist), NULL);

exits with: "ERROR: type "text[]" does not exist"

It seems like array types should be converted from "text[]" to "_text" before sending to luaP_gettypeoid
or actually, luaP_gettypeoid should be replaced more or less by parseTypeString()