Updating installROOT.sh

[raulena333]

• Fixing typo in installROOT.sh.
• Disabling xrootd and upgrading ROOT to 6.28.02

[lobis]

I think this is a good opportunity to discuss dropping the full compilation of root in favour of just installing the pre-compiled distribution. The latest versions (for Ubuntu 22.04 atleast) are all compiled with C++17 and all required options such as gdml. What do you think @rest-for-physics/core_dev ?

[jgalan]

I think this is a good opportunity to discuss dropping the full compilation of root in favour of just installing the pre-compiled distribution. The latest versions (for Ubuntu 22.04 atleast) are all compiled with C++17 and all required options such as gdml. What do you think @rest-for-physics/core_dev ?

I think we could recommend the pre-installed versions. But we can still maintain this compilation script in case we need to enable other features.

[jgalan]

The present PR is disabling xrootd and fixing a small bug with the directory name. Just approve.