Cumulative graph export to csv outputs cumulative (bad)

[shermanl]

Description of Error
Currently, mortalities are plotted in "Ecosim plots" as cumulative, and are extracted as such to csv files. However it appears that these values are absolute.

Steps leading up to the error.
Loading any model with any scenario, "Ecosim plots" plot mortality components as cumulative, with the difference between the two being the absolute value. When these values are extracted, the cumulative values are extracted, rather than the absolute. I suggest absolute values be extracted rather than assuming the user will do it. Or at least documentation in the manual that values are cumulative.

[jeroens]

ZedGraphHelper?, which generates the CSV output, now KNOWS whether a panel is cumulative. This means that the CSV write logic is capable of reconstructing the original non-cumulative data.

[jeroens]

Done. I've also concocted a better default name for the graph csv file.

[jeroens]

..and cursor lines are not included in the csv file