Previously, if kiss-size was ran on a package that owns a lot of
files, kiss-size would error out. This is because du wasn't
able to handle the number of files provided to it.
This patch solves this issue, by avoiding the generation of the 'files'
variable, and instead piping directly into xargs which then feeds the
files to du.
For an example package that breaks with the previous implementation,
see https://github.com/ehawkvu/kiss-tex/tree/master/texlive/texlive-fontsextra
which installs around 94,000 files.
Seeing as how these utilities are now better integrated,
more effort should go into the overall interface between
what should be the "benchmark" or example kiss scripts.
kiss' help output will now include all executables found in $PATH
which begin with kiss-*. A comment string is optionally usable via
setting the second line of the script to a string.
Example:
...
This also means that 'kiss <script name>' is also possible now.
If I have a script in my $PATH called kiss-depends, I can now use
it via kiss with 'kiss depends'.
