Represent 'unit' as C 'int'; change pattern match compilation to avoid 'goto'; change Postgres prepared statement compilation to make life easier for the GCC escape analysis; all this in support of better tail call optimization

fun more n =
    if n <= 0 then
        "!"
    else
        more (n-1) ^ more (n-1)

fun main n =
    debug "Let's give this a try....";
    return <xml>{[more n]}</xml>