Publish draft patchsets in UI and SSH

Adds Publish button to draft patchsets in UI and an option to
publish draft patchsets in the review ssh command. Publishing a draft
patchset makes it visible. Publishing a draft patchset in a draft
change irreversibly upgrades the change status to NEW.

Change-Id: I8ad8ed9d69f3f9e876a9288f568ae3e003a0e257

gerrit-gwtui/src/main/java/com/google/gerrit/client/changes/ChangeConstants.java

@@ -138,6 +138,8 @@ public interface ChangeConstants extends Constants {
   String headingRestoreMessage();
   String buttonRestoreChangeSend();
 
+  String buttonPublishPatchSet();
+
   String pagedChangeListPrev();
   String pagedChangeListNext();