Fix issue 73

fixed the documentation for all of the chemistry software (minus molpro), machine-learning/tensorflow and introduction, lang/python, numlang/matlab and octave

found issues added as comments in the markdown source code

docs.it4i/software/chemistry/gaussian.md

@@ -252,11 +252,15 @@ exit
 [a]: https://gaussian.com/gaussian16/
 [b]: mailto:support@it4i.cz
 [c]: https://gaussian.com/man/
-<!--- 2021-03-31
+<!---
+2021-04-08
+GPU-based Gaussian has been tested on Barbora.
+
+2021-03-31
 ## Notes
 deleted the Gaussian/16_rev_c0-binary in the table for Salomon
 
-## TODO
+## obsolete 2021-03-31
 On Barbora, loading following module results in an error, but the Gaussian runs just fine:
 [opr0019@login1.barbora gaussian-test]$ ml Gaussian/16_rev_c0-binary-Linda 
 sed: can't read /lscratch//nodefile-cn-sn: No such file or directory