Further Improvements

[theHenks]

• [x] Maxmimum, minimum etc. filter
• [x] Maximum pick-off filter with interpolation for current max pick-off
• [x] signalstats with function evaluation upfront for decay time extraction
• [x] Intersect maxtot capability so that you can choose between mintot and maxtot
• [ ] Floating number filter values for global optimization routines