Apply Time Series overwrites original forcing function data

[jeroens]

When applying Time Series of type 3 and 4, original Fishing Rate or Fish Mortality shape data will be overwritten by time series data. This has two malicious effects:

1. If the user Saves the Ecosim scenario after applying such Time Series data, his/her original Fishing Rate or Fish Mortality values are lost
2. Unapplying such Time Series will restore the original Fishing Rate or Fish Mortality data.