Moved `fitPeaks` to `StackAnalyzer` class and added `_fitPeaks_sub` to `SIMStackAnalyzer` and overloaded the `fitPeaks` method.
Moved `fitPeaks` to `StackAnalyzer` class and added `_fitPeaks_sub` to `SIMStackAnalyzer` and overloaded the `fitPeaks` method.

david-hoffman/peaks