init/bash_completion.in: add 'ml' command support

[adrien-cotte]

Hello,

Module 4 is a really good surprise, but I was disappointed to see that "ml" command had no bash completion.
All these fields are covered:

• every "module" options and commands;
• every "module load" options;
• every "module list" options;
• every loaded module with "-" suffix (ex: "-gcc" if "gcc" module is loaded).

Hope it helps!
Adrien

[codecov]

Codecov Report

Merging #323 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #323   +/-   ##
=======================================
  Coverage   99.35%   99.35%           
=======================================
  Files           2        2           
  Lines        2959     2959           
=======================================
  Hits         2940     2940           
  Misses         19       19           

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[xdelaruelle]

Thanks for this contribution. Bash users will deeply appreciate it.

I have just added one change : not defining the ml completion if ml command is not defined (in case ml option has been disabled).