[STUMP] Window name truncation

[Manuel Giraud]

Hi, here's a quick and dirty patch to support window name truncation in
the echo window:

---8<-----------------------------
cvs diff: Diffing .
Index: core.lisp
===================================================================
RCS file: /cvsroot/stumpwm/stumpwm/core.lisp,v
retrieving revision 1.7
diff -r1.7 core.lisp
68c68
<         (window-name w)))
---
>         (subseq (window-name w) 0 *window-name-max-length*)))
Index: primitives.lisp
===================================================================
RCS file: /cvsroot/stumpwm/stumpwm/primitives.lisp,v
retrieving revision 1.4
diff -r1.4 primitives.lisp
90a91,94
> (defvar *window-name-max-length* nil
>   "Truncate the size of the window name in `default-window-format'
> function. NIL means no truncation.")
> 
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-- 
Manuel Giraud (CNRS/CETP)