UTF-8 support for call.

Patch by Cathryn Mataga.

1.  Now supports UTF8 or IBM850 as the encoding style over AX25.
1a.  Attention was paid to make sure that wide characters worked
with East Asian fonts.
2.  Now the screen can be resized.
correctly.   The program no longer crashes when it is resized.
3.  Added a scrollback buffer.  Use the up and down arrow keys
or the page up/page down keys to scroll through history.
After the screen begins scrolling, press 'up arrow' to view
history.
4.  Many visual quirks have been fixed.

This version is now dependent on iconv and wide character
versions of ncurses, which I think should be everywhere these
days.

Signed-off-by: Thomas Osterried <ax25@x-berg.in-berlin.de>

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