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Add new function CST_Bind()

Merged vagudets requested to merge dev-CST_abind into master

Hi @tkariyat

I'm opening this MR for a new function I have developed, CST_Bind(). Its purpose is to bind two s2dv_cube objects together along a specified dimension.

It is basically a wrapper of abind::abind(). The function has two levels:

  1. Bind(): designed to work with arrays with named dimensions. It binds the arrays along the dimension specified in along and preserves the dimnames. (abind::abind() does not accept dimension names and it does not preserve the dimension names in the array).
  2. CST_Bind(): designed to work with s2dv_cube objects. It binds the arrays in $data using Bind() and it also manipulates the $dims, $coords and $attrs to match $data.

For example, if a user binds two s2dv_cubes along the time dimension, the dates in $attrs$Dates will be bound together as well.

The function is not finished yet, I still need to polish some details. I will let you know when it's done so you can review it and test it.

Thank you,

Victòria