#47 fixed the issue
- the transfer was in fact complete, the .part file was done by Krusader
  on my local machine
- so dropped the .part extension check in the ftplet
- changed ftp properties to allow any number of connectons from 1 IP,
  but still limit overall to 5
- logging in security event added if delete was not OK
- download all sources by default in maven (helped resolving this issue)
- updated test