add: keep track of number of sends

[GoogleCodeExporter]

Keeps track how often a file is send.
this is useful when a file is resend (ser indicated or communication error or 
automatic resend).
also: user can not resend files that already have been resend (but they can 
always resend the last resend).
Number of sends is display in outgoing screen.

Original issue reported on code.google.com by hjebb...@gmail.com on 21 Aug 2012 at 2:58

[GoogleCodeExporter]

Original comment by hjebb...@gmail.com on 21 Aug 2012 at 2:58

• Changed title: add: keep track of number of sends

[GoogleCodeExporter]

Original comment by hjebb...@gmail.com on 10 Sep 2013 at 12:45

• Changed state: Done