fix malformed XML in opendap (ddx) requests
fix malformed XML in opendap (ddx) requests

fixes issue #150
(cherry picked from commit 58d6a6f2863a8dee7901186949a94d0a8b6d7b81)

Unidata/netcdf-java,Unidata/netcdf-java,Unidata/netcdf-java,Unidata/netcdf-java,Unidata/netcdf-java,Unidata/netcdf-java,Unidata/netcdf-java