Expand paths that use ~ to full path

[minchinweb]

It seems that ~ (meaning the user directory) must be explicitly expanded when used on the configuration to successfully upgrade.

I can't test this directly, as I don't have a Mac system locally. I don't think there are any applicable tests to be written.

c.f issue #689

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[alichtman]

Looks good to me.

[lock]

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