close streams more consistently (outside of encrypt/decrypt), force a new output filename guess if the ASCII armour checkbox state changes

src/org/thialfihar/android/apg/Apg.java

@@ -1314,7 +1314,9 @@ public class Apg {
         }
         compressGen.close();
         encryptOut.close();
-        out.close();
+        if (armored) {
+            armorOut.close();
+        }
 
         progress.setProgress("done.", 100, 100);
     }
@@ -1625,8 +1627,6 @@ public class Apg {
                 }
             }
 
-            out.close();
-
             if (signature != null) {
                 progress.setProgress("verifying signature...", 80, 100);
                 PGPSignatureList signatureList = (PGPSignatureList) plainFact.nextObject();