- Catch OOM when creating torrent (tickets #364 and #366)

- Fix changing 'use open trackers' config setting (old bug)
- More TrackerClient fixes for no primary announce
- More BEValue.toString() improvements for debugging

apps/i2psnark/java/src/org/klomp/snark/web/I2PSnarkServlet.java

@@ -1902,6 +1902,8 @@ private static class FetchAndAdd implements Runnable {
                     }
                 } catch (IOException ioe) {
                     _manager.addMessage(_("Torrent at {0} was not valid", urlify(_url)) + ": " + ioe.getMessage());
+                } catch (OutOfMemoryError oom) {
+                    _manager.addMessage(_("ERROR - Out of memory, cannot create torrent from {0}", urlify(_url)) + ": " + oom.getMessage());
                 } finally {
                     try { if (in != null) in.close(); } catch (IOException ioe) {}
                 }