Set up gaussian smoothing to use an asymmetrical kernel

[zdanaceau]

The CWT of a typical MS transient can be very asymmetric in the sense that the number of points on the time axis can exceed the number of points in the frequency axis by multiple orders of magnitude. Currently our gaussian smoothing class only uses symmetrical 2D gaussian kernels to smooth data which may lead to insufficient smoothing in one axis and too much smoothing in another.

Adding the option to use an asymmetrical gaussian would allow us to smooth data in a manner consistent with the actual dimensions of our CWT data. This is especially important for finding maxima in plots where there may be time axis oscillation in the in the regions where a peak is meant to be identified. An example of this is shown in the attached files. The first contains the CWT of a transient corresponding to a complex mass spectrum and the second shows high frequency oscillations in many of the peaks appearing in this transient.
complexTransient_modulus.pdf
zoomed_Band2complexTransient_modulus.pdf