Test "X within depth d cm" given an existing diagnostic

Many WRB sub-qualifiers (Endo-, Bathy-, Hyper-, Pano-, Ortho-, Ano-, etc.) are depth-bounded modifiers of an existing principal qualifier or diagnostic horizon. This helper tests whether the base diagnostic fires AND has any of its passing layers in the given depth window.

Usage

.q_within_depth(name, base_diag, pedon, top_cm, bottom_cm)