Opendap is not properly escaping strings in a DAS

[DennisHeimbigner]

re: e-support PXS-613580
It appears that the opendap (dap2) code is not properly handling backslash
characters embedded in DAS string constants.
See for example:
http://stellwagen.er.usgs.gov/thredds/dodsC/TSdata/MVCO_14/10103whp-cal.nc.das
which has a constant like this:
String WavesMonCfg.OutPath "C:\data\MVCO14\101003_ADCP767\wavesB";

This server claims to be
THREDDS Data Server [Version 4.6.3 - 2015-08-31T15:28:06-0600] Documentation

[DennisHeimbigner]

Fixed by pull request #601