Improve formatting of lists

List layout adjustments in the SKS LaTeX path: list item spacing and the
surrounding document style tuned in list.py, latex_util.py,
document.sty, and block.k.

Assembled from dev commit f34e66a4dbfb.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

sks/document/sty/document.sty

@@ -2,12 +2,8 @@
 \usepackage{titletoc}
 \usepackage{ifthen}
 
-%% \pretolerance 1000
-%% \tolerance 2000
-%% \exhyphenpenalty 0
-%% \clubpenalty 5000
-%% \widowpenalty 5000
-%% \displaywidowpenalty 5000
+\widowpenalty=10000 
+\clubpenalty=10000 
 
 \setlength{\hoffset}{-1in}
 \setlength{\voffset}{-1in}