Added metrics, concept counter, better ghost handling to filter some featuresm amd maybe some other stuff

Better filtering for ghost types in adhoc detection, plus some comments

Fixed an oversight during the process of reducing the extent

Take into account that a super feature ca nhave a bigger extent

Pushing non-working version as backup

Ordered attributes names in nodes, tried to improve purge, and improve final display with layers

Fixed a bug where the node extent was incorrect when failing to find introduced feature

Added IGhost interface and filtered derived attribute from output

Added better filtering for extent, rounded corners for graphviz, and fixed propagation fo inherited attributes

Added algorithms to properly filter the right features

Improved detection of independent occurrences to filter the extent

Fixed purge of extent for real

Fixed purge of extent, now only considering 'normal' attributes

Fixed a bug for root and leaf attributes

Improved algorithm for building the extended relation