allow messages to be of arbitrary length: fixes crashes

* Messages can be arbitrarily long, e.g. the following could provoke crashes in interactive mode
  `1000<@I/X/> HX$`
  It's hard to turn into a test case, though, as you could always increase the buffer
  size in teco_interface_msg().
* The message length is now only limited by RAM.
* This implementation is less effective, but code opting for efficience,
  including all programmable user messages, should not rely on the printf-API anyway
  but use teco_interface_msg_literal().

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