This function provides a <= comparison of two projections.
Sorting of fxt header is given by node_header, fxt_blocksize and last by factor.
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| type(ply_fxt_header_type), | intent(in) | :: | left | projection to compare  | 
||
| type(ply_fxt_header_type), | intent(in) | :: | right | projection to compare against  | 
is smaller??