PackWriter: Remove constructor with only Reader as param

At construction time, PackWriter receives the PackConfig as a
parameter or reads it from the repository. The only exception is when
the constructor receives only a reader (no repo nor conf
provided?!).

Remove PackWriter(Reader) and let callers be explicit what conf to
use. This makes clearer the flow of conf in the PackWriter.

Change-Id: If12e122797ffc8c44fc3c435ca1b000ca016645b

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/ShowPackDelta.java

diff --git a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/ShowPackDelta.java b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/ShowPackDelta.java
index c95f138..74e322f 100644
--- a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/ShowPackDelta.java
+++ b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/ShowPackDelta.java
@@ -31,6 +31,7 @@
 import org.eclipse.jgit.pgm.TextBuiltin;
 import org.eclipse.jgit.revwalk.RevObject;
 import org.eclipse.jgit.revwalk.RevWalk;
+import org.eclipse.jgit.storage.pack.PackConfig;
 import org.eclipse.jgit.util.TemporaryBuffer;
 import org.kohsuke.args4j.Argument;
 
@@ -68,7 +69,7 @@ protected void run() throws Exception {
 		ObjectReuseAsIs asis = (ObjectReuseAsIs) reader;
 		ObjectToPack target = asis.newObjectToPack(obj, obj.getType());
 
-		PackWriter pw = new PackWriter(reader) {
+		PackWriter pw = new PackWriter(new PackConfig(), reader) {
 			@Override
 			public void select(ObjectToPack otp, StoredObjectRepresentation next) {
 				otp.select(next);

org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsPackFileTest.java

diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsPackFileTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsPackFileTest.java
index bc851f8..9680019 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsPackFileTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsPackFileTest.java
@@ -41,6 +41,7 @@
 import org.eclipse.jgit.lib.NullProgressMonitor;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.revwalk.RevWalk;
+import org.eclipse.jgit.storage.pack.PackConfig;
 import org.eclipse.jgit.transport.ReceiveCommand;
 import org.junit.Before;
 import org.junit.Test;
@@ -309,7 +310,7 @@ private ObjectId setupPack(int bs, int ps) throws IOException {
 
 	private void assertPackSize() throws IOException {
 		try (DfsReader ctx = db.getObjectDatabase().newReader();
-				PackWriter pw = new PackWriter(ctx);
+		     PackWriter pw = new PackWriter(new PackConfig(), ctx);
 				ByteArrayOutputStream os = new ByteArrayOutputStream();
 				PackOutputStream out = new PackOutputStream(
 						NullProgressMonitor.INSTANCE, os, pw)) {

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriter.java

diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriter.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriter.java
index 4350f97..d3e30f3 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriter.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriter.java
@@ -303,19 +303,6 @@ public PackWriter(Repository repo) {
 	}
 
 	/**
-	 * Create a writer to load objects from the specified reader.
-	 * <p>
-	 * Objects for packing are specified in {@link #preparePack(Iterator)} or
-	 * {@link #preparePack(ProgressMonitor, Set, Set)}.
-	 *
-	 * @param reader
-	 *            reader to read from the repository with.
-	 */
-	public PackWriter(ObjectReader reader) {
-		this(new PackConfig(), reader);
-	}
-
-	/**
 	 * Create writer for specified repository.
 	 * <p>
 	 * Objects for packing are specified in {@link #preparePack(Iterator)} or