There is no need to test a status file for correctness as the status
class will simply create a new object with default values in case
parsing an existing file fails.

Refers to #22, #28

One file ("config.common.xml") containing site-global configuration
settings, the other one (the file name equals the host name with a
".xml" suffix) containing host-specific settings.

Both files use the same syntax and may contain the same setting
attributes with the host-specific one having priority over the
site-global one.

Refers to #18

Refers to #3

Refers to #28

Following the new naming guidelines.

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

Currently this is almost entirely untested and configuration for email
notifications is yet to be done.

Refers to #3

Since we have more to share between the applications than just the XML
wrappers, this is the location to keep common classes and methods.

Fixes #22