Following the new naming guidelines.

All projects (and namespaces) should start with an "ATx" prefix, having
a capital "AT" and a lowercase "x".

Refers to #3

Refers to #25

Refers to #3, #4

All outputs of any kind of duration should be using a human readable
variant of the time span.

Fixes #25

Since they only depend on current configuration settings they should as
well be accessible through the config class. This way they can be used
in a consistent fashion across different projects.

This allows us to re-use the summary method in other tools like the tray
application.

This can probably safely be removed once the logging has stabilized and
is tested in production.

Refers to #3

Refers to #3

CreateNewDirectory, CheckForDirectory and CollectOrphanedFiles.

Therefore the corresponding code can be simplified a lot.

Refers to #3

To avoid flooding recipients and / or SMTP servers.

Refers to #3, #4

Refers to #3

Refers to #3

Refers to #3

Refers to #3

The "From" entry was missing resulting in emails not being sent.

Refers to #3

Fixes #24

With proper logging in place this is now easily doable, therefore we
don't need the "ValidationWarnings" workaround any more.

Refers to #3

With proper logging in place this is now easily doable, therefore we
don't need the "ValidationWarnings" workaround any more.

Refers to #3

Refers to #3