SIS-185 :
- ShapeFile public variable members reduced to private. Method getFeatureMap() added to allow a test to continue working.
- FieldDescriptor public variable members reduced to private.
- Database methods : close, isClosed, loadRowIntoFeature and readNextRowAsObjects marked as deprecated to warn programmers against using them.

git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK8@1647263 13f79535-47bb-0310-9956-ffa450edef68