first draft
added public interface
setting segment names in copy operation
name fixed (setting segment name to itself does nothing, appending _already_in_use to segment name if name is already in use)
bugfix for hexahedrons (a hexahedron has 8 points, not 6 *facepalm*)
Merge branch 'FlorianRudolf/feature-circumcenter-points' into FlorianRudolf/feature-low-level-api
Merge branch 'FlorianRudolf/fix-named-segments' into FlorianRudolf/feature-low-level-api
free segment name point when setting new segment count, typo
added vertex_element_count query, fixed warnings
added example program