Uninstaller does not remove Cygwin DLLs and executables

[dev-zero]

While verifying the Sepiola test case

http://wiki.sepiola.org/index.php/Sepiola_Installation/Deinstallation#ID_2.2:_Deinstallation

I found that the uninstaller fails to remove Cygwin-related DLLs and executables.

Mode                LastWriteTime     Length Name
----                -------------     ------ ----
d----        22.11.2016     22:54            bin


    Directory: C:\Program Files\sepiola\bin


Mode                LastWriteTime     Length Name
----                -------------     ------ ----
-a---        22.11.2016     15:25      12819 cygcom_err-2.dll
-a---        22.11.2016     15:25    2288659 cygcrypto-1.0.0.dll
-a---        22.11.2016     15:25      71187 cyggcc_s-seh-1.dll
-a---        22.11.2016     15:25     263699 cyggssapi_krb5-2.dll
-a---        22.11.2016     15:25    1033235 cygiconv-2.dll
-a---        22.11.2016     15:25      42515 cygintl-8.dll
-a---        22.11.2016     15:25     180755 cygk5crypto-3.dll
-a---        22.11.2016     15:25     739347 cygkrb5-3.dll
-a---        22.11.2016     15:25      35859 cygkrb5support-0.dll
-a---        22.11.2016     15:25      42003 cygpopt-0.dll
-a---        22.11.2016     15:25      12307 cygssp-0.dll
-a---        22.11.2016     15:25    3306962 cygwin1.dll
-a---        22.11.2016     15:25      81437 cygz.dll
-a---        22.11.2016     15:25    1834697 rsync.exe
-a---        22.11.2016     15:25     626707 ssh.exe

[ghost]

It seams that we have to remove all DLLs and tools bevore deleting the /bin folder.
An approach is to delete the /bin folder even if it is not empty.

[dev-zero]

reopening based on todays the discussion

[dev-zero]

ok now, tested with sepiola-2.3.5-23-g1243b77-win64.exe