Reliance on Default Encoding

[jonknight73]

There are 2 instances of reliance on default encoding reported in FindBugs run on the Master branch.

Reliance on default encoding

Found a call to a method which will perform a byte to String (or String to byte) conversion, and will assume that the default platform encoding is suitable. This will cause the application behaviour to vary between platforms. Use an alternative API and specify a charset name or Charset object explicitly.
 
Bug kind and pattern: Dm - DM_DEFAULT_ENCODING

Line 265 in org.alfasoftware.morf.xml.ViewURLAsFile

      String basicAuth = "Basic " + new String(Base64.getEncoder().encode(userpass.getBytes(StandardCharsets.UTF_8)));

And line 288 in org.alfasoftware.morf.metadata.ValueConverters

      return new String(Base64.getEncoder().encode(value));