Bug #4149 Handling of Time column not correct

Description:
In Field.cs the handling of a database time column has it such that a value of "00:00:00" returns a DBNull value. "00:00:00" is in fact midnight and a valid time. It should not return null, it should return "00:00:00".

Part of the problem here is that the .NET data type TimeSpan gets itself in a mess with times (it only does 00:00:00 to 23:59:59, and does nt handle 24:00:00), which the MySQL column type "Time" accepts.  

How to repeat:
Create a table with a Time column, set the value of the column to 00:00:00
Read the table record with the ByteFX driver
Get a DBNull value

Suggested fix:
Remove an "if" statement in the handling of MySqlDbType.Time. Maybe checking for 24:00:00 would be more appropriate.

Verified; thank you for the report.

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Additional info:

Values 00:00:00 and 24:00:00 should come through ok now.