[FIX] filegals: More on "home" file gallery pref list - 'id' used by some routines, 'galleryId' by others? (just patched over here, but should be sorted for 13)

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[FIX] filegals: If "home" file gallery pref not set then use the default root for elFinder

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48677 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] Changes added to fix Wrong creation and modification date in spreadsheets list   Ref: http://dev.tiki.org/item4338

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