Space and Inodes for MDTs show in ltop

[ofaaland]

Space free and total space metrics are reported for MDTs like they are for OSTs. Include them in the display provided by ltop.

Originally written as part of a larger patch by Phil Eckert. Semantic changes factored out by Olaf Faaland.

This increases the window width from 80 to 90 characters.

Closes #34

[ofaaland]

@tonyhutter Thanks for the review. I updated to address the issues you pointed out, please take another look.

[ofaaland]

Cherry-picked to master:

• c895fee (HEAD, llnlgit/master, master) Space and Inodes for MDTs show in ltop
• 738f002 (tag: 3.2.6, llnlweb/master) Prep for tagging LMT 3.2.6