Initial processing algo done, this looks at changes in five minute wind data

If the change is larger than forty percent of the total capacity of the wind
farms output for that period (relative basis, moving target) then it
assesses that the period may be of interest. It will take a ten minute
slice either side of this and save the result to a file for later processing
Methods to find and calculate some basic metrics based upon the epoc have
been added.

In addition a recursive search method to iterate through the available data
has been added.
No commenting or tests
Bug fixes, updated method
Couple more fixes, not sure as I did them yesterday and didn't commit them
then...