fix #Q159 - segfault with super long item names

fix #Q159 - segfault with super long item names

     From a bug report, putting an object with
really long specific and type names into a container with really long
specific and type names caused the program to crash.  pline() overflowed
the buffer it formatted into, and even though it was able to send that
for output and trigger a --More-- prompt, eventually a segfault occurred.
Give vpline and vraw_printf a much bigger working buffer, then truncate
the formatted text to BUFSZ - 1 characters so that we don't just push the
long line trouble into the separate interfaces.