CHG: Added calling clear bigbuff to zero out it also, instead of just "free" it.

ADD:  downloading the EML part from BigBuffer specially.

client/data.c

@@ -23,3 +23,10 @@ void GetFromBigBuf(uint8_t *dest, int bytes, int start_index) {
 	clearCommandBuffer();
 	SendCommand(&c);
 }
+void GetEMLFromBigBuf(uint8_t *dest, int bytes, int start_index) {
+	sample_buf = dest;
+	UsbCommand c = {CMD_DOWNLOAD_EML_BIGBUF, {start_index, bytes, 0}};
+	clearCommandBuffer();
+	SendCommand(&c);
+}
+