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* Allow DataWriter to merge existing ticks if desired
- Optionally allow lean data writer to merge new ticks with existing
- Adjust ZipStreamWriter
- Fix bug in compression lib that was leaving files open. Reproduced by
added tests.
* Address reviews
- Define new WritePolicy to configure the behavior of the LeanDataWriter
regarding how it should handle writing to a file: merge, overwrite,
append
The `NullReferenceException` type is intended to only be thrown by the CLR.
In most cases, it should be converted to an `ArgumentException` or an
`InvalidOperationException`, depending on if the null value is a parameter
to the current method or not.
The `Exception` type should never really be thrown as it doesn't provide any
additional information or hints as to the issue. It also forces users that
would like to handle expected exceptions to catch all exceptions. These are
converted to an exception type that more accurately describes the reason for
raising the exception: `KeyNotFoundException`, `InvalidOperationException`