Add <superbuild_install_prefix>/share to XDG_DATA_DIRS environment variable to support yarp bash autocompletion out of the box

[traversaro]

Fix #622 .

[S-Dafarra]

Cool! Does it work also on Windows?

[traversaro]

Cool! Does it work also on Windows?

I did not tested it, but it could work assuming that you installed bash-completion and you use Git Bash. However, in any case I prefer to set XDG_DATA_DIRS coherently across all platforms as this env variable could also affect other software.

[traversaro]

Cool! Does it work also on Windows?

I did not tested it, but it could work assuming that you installed bash-completion and you use Git Bash. However, in any case I prefer to set XDG_DATA_DIRS coherently across all platforms as this env variable could also affect other software.

If Instead you were referring to to the Powershell-based autocomplete (https://github.com/robotology/yarp/tree/master/data/WindowsPowerShell) I still need to check how to integrate it.

[traversaro]

I tested on a real Ubuntu 20.04 box and it seems to work fine!