julia

ffe157ed - attempt to make error and warning message formatting more consistent

attempt to make error and warning message formatting more consistent - we use ERROR: and WARNING: in util.jl, so might as well use it everywhere even though I hate the uppercase - exception messages (passed to jl_error etc.) should generally not use an explicit ERROR: prefix, as that is implied and may be added by printing code later - exception messages should not end with \n (the newline is formatting, not part of the message)