Trim array

Remove columns and rows that are empty or that contain only NaN's in the input arrays, in the beginning, in the end, in both extremities or in the entire array

USAGE
[out1,out2,...] = trim_array(action,array1,array2,...)
output = trim_array(action,array1,array2,...)

INPUT
- ACTION: 'beginning', 'end', 'edges', or 'all'
- 'beginning': remove only the first rows and columns
- 'end': remove only the last rows and columns
- 'edges': remove the both the first and last rows and columns
- 'all': remove all rows and columns with NaN or empty elements
- ARRAY : cell or numeric array

OUTPUT
- OUTPUT: If N input arrays are given, with N outputs, each output is the corresponding trimmed array. If one output is given, it is a cell array containing the trimmed arrays in each element.