* module/ice-9/pretty-print.scm (truncated-print): Set
`%default-port-encoding' to the encoding of PORT. Choose either
U+2026 or "..." depending on PORT's encoding.
* test-suite/tests/print.test ("truncated-print")[tprint]: New ENCODING
argument. Update existing tests accordingly. Add UTF-8 tests.
* doc/ref/misc-modules.texi (Pretty Printing): Mention the possible use
of U+2026.
* module/ice-9/pretty-print.scm (pretty-print): Rework so "port" is the
kwarg, and "port*" is the optional arg. #:port is still the keyword.
(truncated-print): Add a printer that will ensure that the output
stays within a certain width. It could use genwrite but it doesn't
because it seems nice to allow breadth-first allocation of screen
space, and it's also nice to balance some delimiters (e.g. #< and >).
Moved ice-9/ and oop/ under module/, with the idea being that we have
only scheme under module/. Adjusted configure.in and Makefile.am
appropriately. Put oop/ at the end of the compilation order.
