create_wvar: Create a Wvar object
In gmwm: Generalized Method of Wavelet Moments

Structures elements into a WVar object

1	create_wvar(obj, decomp, robust, eff, alpha, scales, unit)

`obj`	A `matrix` with dimensions N x 3, that contains the wavelet variance, low ci, hi ci.
`decomp`	A `string` that indicates whether to use the "dwt" or "modwt" decomposition
`robust`	A `boolean` that triggers the use of the robust estimate.
`eff`	A `double` that indicates the efficiency as it relates to an MLE.
`alpha`	A `double` that indicates the (1-p)alpha* confidence level
`scales`	A `vec` that contains the amount of decomposition done at each level.
`unit`	A `string` that contains the unit expression of the frequency.