WCPS_Supports user defined band names in range constructor

[Bang Pham Huu]

current WCPS checks band names strictly (i.e: if in range constructor has a non-existing band, it will throw exception). This is necesary as in netCDF, it can write in coverage metadata user defined band names and should be supported.

WCPS query example:

for c in ( test_rgb ) return encode(
 { blueTEST: c.red; redTEST: c.blue }.redTEST
, "netcdf")

the output should have redTEST as band name in netCDF.

\"redTEST\":{
   \"type\":\"unsigned char\",\"metadata\":{\"units\":\"10^0\"},\"name\":\"redTEST\"}