Update for GeoAPI changes: replaced MD_CharacterSet code list by direct use of java.nio.charset.Charset.
The reason for this change is that ISO 19115:2003 defined its own code list for character sets, while
ISO 19115:2014 still define an MD_CharacterSetCode but the new definition does not enumerate any element
and instead refer to IANA registry (http://www.iana.org/assignments/character-sets/character-sets.xhtml).
Consequently there is no need anymore to handle the ISO 19115:2003 custom names in the Apache SIS API.
The java.nio.charset.Charset class use IANA names, so it is suitable for this new situation.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK8@1615098 13f79535-47bb-0310-9956-ffa450edef68