Shifts set of spectra to a new Maximum position

Three functions allowing to shift set of spectra to the same or different maximum of peaks

Three functions are included:
1. shift_spectra_or - shifts set of spectral vectors to a new common maximum at the same accuracy as original data

2. shift_spectra - shifts set of spectral vectors to a new common maximum at 10X better accuracy than original data - to solve the problem of sensitivity of statistical analysis methods to small shift in spectra

3. shifts each spectrum in the data set to a different maximum position