Encapsulate a configuration structure error.
Within the scope of the com.mucommander.commons.conf
API, structure errors
are inconsistencies in the structure of the configuration tree - a section closed more
than once, for example, or never closed at all.
This exception is mostly meant to be used by implementations of
ConfigurationBuilder,
as they have to analyse the structure of the configuration they're receiving events for.
Since ConfigurationStructureException
subclasses
ConfigurationException, it
inherits his capacity to wrap other exceptions.