Add a rebinning ability

[marshallmcdonnell]

Here is the rebin code I have that did this previously. Want it for smoothing via coarsening the binning:

#!/usr/bin/env python
from __future__ import (absolute_import, division, print_function)

import numpy as np
import argparse
import matplotlib.pyplot as plt

def rebin2_rmc(xin, yin, minx, xdiv, maxx):
    xout  = np.arange(minx, maxx+2.*xdiv, xdiv)
    yout  = np.zeros_like(xout)
    ynorm = np.zeros_like(xout)
    print('Number of points ', len(xout))

    for x, y in zip(xin, yin):
        if minx <= x and x<= maxx:
            idx = int((x-minx)/xdiv)
            scale1=1.-(x-xout[idx])/xdiv
            scale2=1.-scale1

            yout[idx]   = yout[idx]   + y*scale1
            yout[idx+1] = yout[idx+1] + y*scale2

            ynorm[idx]   = ynorm[idx]   + scale1
            ynorm[idx+1] = ynorm[idx+1] + scale2

    yout = yout / ynorm

    return xout, yout