Finish metadata reshaping for retrieve = TRUE, including different combinations of merge_across_dims, merge_across_dims_narm, and split_multiselected_dims

Develop time unit condition

See merge request !176

Update package to 2.2.0

See merge request !174

Change function chunk_indices() to get_chunk_indices() because chunk_indices is an item in some functions

Initialize big.matrix

See merge request !172

Create transform_crop_domain beforehand

See merge request !173

Fix typo and conditional statement for warnings

See merge request !171