Add one new test file in testsuite/tests/generated-parse-errors/error…

…s.ml.

This file was produced by [make generate-parse-errors].

This file contains:
    1072 sentences whose start symbol is implementation.
       5 sentences whose start symbol is use_file.
       9 sentences whose start symbol is toplevel_phrase.

The parser's output can be described as follows:
    1086 syntax errors reported.
     721 syntax errors without explanation.
     365 syntax errors with an indication of what was expected.
     307 syntax errors with an indication of an unmatched delimiter.