Release emulator version 0.16:

1. Fix zero-length datacom message read in IOUnit.
2. Insert additional delay at end-of-message for B5500DatacomUnit.
3. Fix minor behavioral problems in B5500MagTapeDrive.
4. Minor wiki corrections and enhancements.

webUI/B5500CardReader.js

@@ -184,6 +184,7 @@ B5500CardReader.prototype.CRProgressBar_onclick = function CRProgressBar_onclick
             this.bufLength = 0;
             this.bufIndex = 0;
             this.progressBar.value = 0;
+            this.$$("CRFileSelector").value = null;     // reset the control
             while (this.outHopper.childNodes.length > 0) {
                 this.outHopper.removeChild(this.outHopper.firstChild);
             }