add() method will now parse added, last_downloaded, and times_downloaded

These 3 'stats' properties were read-only (never used when adding a file). To support moving files between FileBases while retaining these stats, support the parse/use of these file-meta-object property values.

Should fix issue #333 reported by Nightfox.
14 jobs for dailybuild_linux-x64 in 9 minutes and 27 seconds (queued for 11 seconds)
Status Job ID Name Coverage
  Build
passed #29984
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jsdoor-freebsd

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passed #29985
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jsdoor-linux

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jsdoor-windows

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sbbs-freebsd

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sbbs-linux

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sbbs-windows

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sexpots-freebsd

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sexpots-linux

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sexpots-windows

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syncdraw-freebsd

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syncdraw-linux

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syncterm-freebsd

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passed #29976
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syncterm-linux

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passed #29981
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syncterm-windows

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