new_field() creates a new field with r rows and c columns, starting at frow, fcol,
in the subwindow of a form. nrow is the number of off-screen rows and nbuf is the number of additional working buffers. This routine returns a pointer
to the new field.
dup_field() duplicates field at the specified location. All field attributes are duplicated, including the current contents of the field buffers.
link_field() also duplicates field at the specified location. However, unlike dup_field(), the new field shares the field buffers with
the original field. After creation, the attributes of the new field can be changed without affecting the original field.
free_field() frees the storage allocated for field.
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