What type of PR is this? (check all applicable)

• Refactor
• Feature
• Bug Fix
• Optimization
• Documentation Update
• Other: Replace this with a description of the type of this PR

Description

This adds new formatting options to the filesystem which allow the user to force the displayed storage amount in to be in a specific unit, that does not change depending on amount available. For example the user could specify gb_free and the output would always be in Gigabytes, even when over 1000 or under 1.

While it is inconsistent with how storage device manufacturers market their products, I use the system that each unit is 1024 of the unit immediately smaller than it rather than 1000, to be consistent with existing code.

Related Issues & Documents

Documentation (check all applicable)

• This PR requires changes to the Wiki documentation (describe the changes)
• This PR requires changes to the documentation inside the git repo (please add them to the PR).
• Does not require documentation changes

The new options would need adding to the wiki