Prevent timeout when waiting for ACK #65
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... and speed up execution of all commands that only have ACK and no other reply because the 500 ms default timeout is not waited for anymore.
new waitSending():
private adaption of waitAvailable() that waits only for the ACK
packet and not one that sets _isAvailable which usually does not
happen and causes unnecessary waiting and timeout signalling;
sendStack():
use waitSending() instead of waitAvailable() because we only need
the _isSending flag to drop;