ADA 1.4.21 uses incorrect units when reporting insufficient free space on drive C:

[davidnutter]

When testing an approx 729Gb archive on a computer with approx 550Gb free space on C: ADA stops with:

========================
[0.3] There is not enough space on C:
Tests cannot be run until there is at least 759,286,000 MB of free space on the drive

This is likely a units error as

759,286,000 MB == 724TB

Whereas

759,286,000 KB == 724GB

Much more reasonable.

Retrying the test on a machine with 900Gb free space on C: allows ADA to proceed with the test.