more terminals tested for fix of issue #1108

Handle aliases for 'xterm', 'xterm-256color' by using 'xterm' if
$TERMCMD starts with 'xterm'.

If $TERMCMD in ['urxvt', 'rxvt-unicode'], use 'urxvt'.

If $TERMCMD in ['rxvt', 'rxvt-256color'], use 'rxvt' if found, otherwise
'urxvt'.

Tested 'termite (13-1)', 'terminology (1.1.1-1)', 'pantheon-terminal (0.4.3-2)'
and 'st (1:0.7.r38.g0ac685f-1)', these all use the -e flag.

Tested 'tilda (1.4.1-1)', which uses -c flag.

'tilda', 'pantheon-terminal', 'terminology' and 'termite' don't work
with the '/bin/sh --set' scheme. As a temp fix, get the application
name and argument from `command` and compose the `cmd` list from these.
See line 397--407 for details.

Let's forget about mac users, shall we?

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