Console: Add tooltip to unban link

Don't show both ban and unban buttons if peer param provided
Don't put hash in form again after ban/unban POST

apps/routerconsole/java/src/net/i2p/router/web/helpers/BanlistRenderer.java

@@ -56,6 +56,7 @@ class BanlistRenderer {
 
         buf.append("<ul id=\"banlist\">");
         
+        String unban = _t("unban now");
         for (Map.Entry<Hash, Banlist.Entry> e : entries.entrySet()) {
             Hash key = e.getKey();
             Banlist.Entry entry = e.getValue();
@@ -82,8 +83,9 @@ class BanlistRenderer {
                     buf.append(_t(entry.cause));
             }
             if (!key.equals(Hash.FAKE_HASH)) {
+                // note: CSS hides anchor text
                 buf.append(" <a href=\"configpeer?peer=").append(key.toBase64())
-                   .append("#unsh\">[").append(_t("unban now")).append("]</a>");
+                   .append("#unsh\" title=\"").append(unban).append("\">[").append(unban).append("]</a>");
             }
             buf.append("</li>\n");
         }

apps/routerconsole/java/src/net/i2p/router/web/helpers/ConfigPeerHelper.java

@@ -5,6 +5,7 @@ import java.math.BigInteger;
 import java.util.Collections;
 import java.util.List;
 
+import net.i2p.data.Hash;
 import net.i2p.router.Blocklist;
 import net.i2p.router.web.HelperBase;
 import net.i2p.util.Addresses;
@@ -132,6 +133,13 @@ public class ConfigPeerHelper extends HelperBase {
         return out.toString();
     }
 
+    /**
+     *  @since 0.9.50
+     */
+    public boolean isBanned(Hash h) {
+        return _context.banlist().isBanlisted(h);
+    }
+
     /**
      *  Convert a (non-negative) two's complement IP to exactly 16 bytes
      *