Reorganised the Unicode layer somewhat: moved luni_send and

lpage_send out into the line discipline, making them _clients_ of
the Unicode layer rather than part of it. This means they can access
ldisc->term, which in turn means I've been able to remove the
temporary global variable `term'. We're slowly getting there.

[originally from svn r2143]

Recipe

@@ -89,7 +89,7 @@
 # line.
 
 # GUI front end and terminal emulator (putty, puttytel).
-GUITERM  = window windlg winctrls terminal sizetip wcwidth unicode
+GUITERM  = window windlg winctrls terminal sizetip wcwidth unicode ldiscucs
          + logging printing winutils
 
 # Non-SSH back ends (putty, puttytel, plink).
@@ -132,5 +132,5 @@ puttygen : [G] puttygen sshrsag sshdssg sshprime sshdes sshbn sshmd5 version
          + sshrand noise sshsha winstore misc winctrls sshrsa sshdss
          + sshpubk sshaes sshsh512 import winutils puttygen.res LIBS
 
-pterm    : [X] pterm terminal wcwidth uxucs uxmisc tree234 misc ldisc
+pterm    : [X] pterm terminal wcwidth uxucs uxmisc tree234 misc ldisc ldiscucs
          + logging uxprint settings pty be_none uxstore