Started creating a D-Flow data class.
Added function prototypes and start of example files in tests.
Basic DFlow test file creation is done.
Added some more.
Start of cleaning constant values code.
Improve time_vector with start time.
More updates to the DFlow data file.
End of day, some tests are passing.
Tests pass on DFlow data, but missing marker replacement needs work.
Fixed constant value non replacement in marker signals.
Marker interpolation now works.
Changed data frame comparisons for Pandas 0.11 support.
Added a command line script for interacting with the DFlowData class.
Added start of walk docs.
Some more on the walk docs.
First pass at DFlowData docs are in.
Spelling.
Added an example comparing interpolated data to raw.
Added time stamp variability plot.
Some walk doc improvements.