Fix a bug in the RowSeq state tracking where the values were still being cast
to an int but needed to be cast to a long to hold two ints instead of two
shorts. This should now allow for rows with more than 32K data points.
Cleanup some comments and code
Add some unit tests for Internal functions to validate > 32K data points.
Add some unit tests to validate parsing data points at the end of an hour in
seconds and milliseconds for Internal functions.
Add unit tests to make sure we handle rows with > 32K data points properly.

Signed-off-by: Chris Larsen <clarsen@euphoriaaudio.com>

Conflicts:
	src/core/RowSeq.java
	src/core/Span.java
	test/core/TestTsdbQuery.java