Convert perl to html for publishing.

adds line numbers and auto indent.
for example see: perl2html.html
Icon  Name                    Last modified      Size  Description
[PARENTDIR] Parent Directory                             -   
[   ] perl2html.zip           2019-03-07 22:21  3.7K  Download file
[TXT] perl2html.html          2019-03-07 22:21  6.1K  Perl code explained 
[   ] perl2html.pl            2019-03-07 22:21  2.6K  The Perl program    

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