Fixing SqlFileFixture.TimeSeriesValues

@jasondegraw I believe the main fix was that we were always flooring number of seconds rather than rounding, the rest of this is error checking and using ctor from seconds in sqlfile

[#62105306]
Fixing TimeSeriesFloodPlot_Detailed_Year

[#62105306]
Tightening tolerance a bit more

[#62105306]
Clearing up comment

[#62105306]
Log error but do not throw on construction of an empty timeseries

[#62105306]
Change Errors to Warnings

[#62105306]
Fixing dashboard failures

[#62105306]
Merge pull request #719 from NREL/62105306_Timeseries

62105306 timeseries