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find positive splike-like peaks, using Delta_raise and Delta_fall thresholds.

## Project description

Find positive spike-like peaks from 1-D array.

## example

```from peakdetect_delta import peakdetect, peakdetect_simpleedge

# peak are represented as a tuple ((pvalue, pidx), (sidx, eidx))
#   pvalue: value at pidx
#   pidx: index of the peak
#   sidx: index where y[sidx+1] - y[sidx] > rdelta
#   eidx: index where y[eidx] - y[eidx-1] < fdelta
#   so, y[sidx:eidx] takes the detected peak

# examples of peakdetect_simpleedge
# case 1.1
s = [0, 0, 1.5, 2, 0, 0]
assert peakdetect_simpleedge(s, rdelta=1, fdelta=-1) == [((2, 3), (1, 5))]

# case 1.2
s = [0, 2, 0, -2, 0, -2]
assert peakdetect_simpleedge(s, rdelta=1, fdelta=1) == [((2, 1), (0, 3)),
((0, 4), (3, 6))]

# example of peakdetect
s= [0, 3, 0, 2, 0, 0, -1, 1, -2, -1]
# same as peakdetect_simpleedge
assert peakdetect(s, rdelta=1, fdelta=-1, minimumspace=-1)
== [((3, 1), (0, 3)), ((2, 3), (2, 5)), ((1, 7), (6, 9))]
# first 2 peaks are merged
assert peakdetect(s, rdelta=1, fdelta=-1, minimumspace=0)
== [((3, 1), (0, 5)), ((1, 7), (6, 9))]
peakdetect(s, rdelta=1, fdelta=-1, minimumspace=2)
== [((3, 1), (0, 9))]
```

## Project details 