Update GINI field name decoding for Unidata composites

[dopplershift]

Some updates are needed to the code that determines the field type for GINI, specifically Unidata's NEXRAD composites:

netcdf-java/cdm/image/src/main/java/ucar/nc2/iosp/gini/Giniheader.java

Lines 848 to 869 in b24beca

	case 26:
	name = "EchoTops";
	break;
	case 27:
	if (ent_id == 99)
	name = "Reflectivity";
	else
	name = "CTP";
	break;
	case 28:
	if (ent_id == 99)
	name = "Reflectivity";
	else
	name = "Cloud_Amount";
	break;
	case 29:
	name = "VIL";
	break;
	case 30:
	case 31:
	name = "Precipitation";
	break;

The code handles neither the current N0Q nor the new N0B composites, which are having their ID's updated:

                                                      effective
Composite   Current Channel ID   New Channel ID    McIDAS Band #
------------+-------------------+-----------------+-------------
    HHC           2**24               2**24              25
    EET           2**25               2**25              26
  **N0R           2**26               2**26              27
    DHR           2**27               2**27              28
    DVL           2**28               2**28              29
    N1P           2**29               2**29              30
    NTP           2**30               2**30              31
    N0Q           2**31               2**23              32 -> 24
   *N0B                               2**31              32

Based on the existing code that's currently working (e.g. working EET vs. incorrect "Unknown" N0B), I think the "effective McIDAS Band" above is the field to use.