Rename BASE_STRUCTURE_RESET to BASE_DISPLAY_E_MASK, to clarify that it's

a mask to select the base_display_e value from a display field in a
header_field_info structure.

Never select that value by masking out the BASE_RANGE_STRING flag bit,
as that won't continue to work if more flag bits, or other bitfields,
are added.  Instead, mask with BASE_DISPLAY_E_MASK.

Note that the base_display_e value and BASE_RANGE_STRING flag are only
for integral field types, and clarify what BASE_DISPLAY_E_MASK is.

Give at least one of the reasons why hiding protocol fields is not
considered a good idea.

svn path=/trunk/; revision=31249

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