Refs #7783 use FindPeakBackground in FindPeaks
Refs #7783 subtract i_min from peak boundaries
Refs #7783 fix valgrid errors
Refs #7783 use same background type
Re #7783. Pick estimate with best chisq
Refs #7783 remove estimateBackground;use int in fitPeakHighBackground
Revert "Refs #7783 remove estimateBackground;use int in fitPeakHighBackground"

This reverts commit 78ceb54275bddd3ecc4afe020e6073acc76eb35c.
Refs #7783 change to int;fit from information to debug
Merge remote branch 'origin/feature/7783_FindPeaks_background'