remove non piraha parser from Flesh

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Issue #2531 new
Roland Haas created an issue

Similarly to #2452 In the Turing release announcements: http://einsteintoolkit.org/about/releases/ET_2020_05_announcement.html we are deprecating the non-Piraha parser which increasingly no longer parses all existing parfiles (eg the non-piraha parfile parser does not handle $foo = 42 types of variable assignments).

It should thus be removed from the code.