It is well known that high or deep cells tend to touch the
\hlines of a tabular. This package provides a modifier S acting
on usual column types so that to ensure a minimal distance that
can be controlled through two parameters \cellspacetoplimit and
\cellspacebottomlimit. The approach employed by this package is
noticeably simpler than that of tabls, which considers the
dimensions of each entire row; whereas you can ask the
cellspace only to look at the cells of potentially difficult
columns.
