BZ49: Rounding errors in FuzzyDate accuracy handling

[harri]

FuzzyDate? accuracies are often converted between long & float, this creates rounding errors (e.g. FuzzyDate?.parse( "2005" ) would create an object with accuracy which is several milliseconds too long. Current workaround is that the accuracu is truncated - correct solution would be to convert the whole accuracy field into milliseconds.

[harri]

This needs database schema change, not a show stopper

[harri]

Correct at the same time as PhotoInfo? in general is refactored.