Log Message:
(editors/TeXmacs) Updated 1.99.11 to 1.99.13

  http://www.texmacs.org/tmweb/about/changes.en.html
1.99.13
- Continued bug fixes
- Switch to Python 3 for plug-ins programmed in Python
- A Parser Framework for programming languages
- Improved Graphviz plugin with documentation in Chinese and syntax highlight
- Improved Maxima plugin with documentation in Chinese and bug fixes
- Improved Octave plugin on Windows for Octave 5.x

1.99.12
- Many bug fixes
- Make it easier to cite work on TeXmacs
- Improved Html import/export filters and support for MathJax
- Faster native (Qt-based) image export of formulas to Html
- Improved large bracket sizes and script positioning
- Various artwork related improvements
- Interface for SymPy
- Re-implement Asymptote, DraTex, Gnuplot, Graphviz, Xypic using
  Python for full platform support
- Documentation on how to write plugins using Python
- Updates of the dictionaries for French and Dutch
- (run-all-tests) aggregates and runs all the tests in Scheme
- Support for Java language