Oceanus and SkillView3

This is a pre-release, experimental version.

The minimum database version has been updated to 17 for the Oceanus 1.0 database, which is included inside the application.

Large changes to the skill plan view. Skill plans are now a master/detail pair of tables.

• All columns can be moved by dragging and dropping the column header.
• Right clicking on a column header will bring up a contextual menu letting you show or hide columns, along with menu items related to sorting.
• Because of the previous changes the Skill Plan related Preference pane is no longer necessary and has been removed.
• Skill plans and skills can be sorted by clicking on a column header, except for columns whose data is calculated (e.g. Running Total, Start/Finish Date).
• The Manual Sort menu item will undo all sorting, reverting you to the last manual sort.
• Sorting skills within a plan may well violate skill pre-requisites. Skills that no longer follow their pre-requisites are displayed with a red name. The "Fix Prerequisites" menu item will attempt a minimal re-ordering of skills to satisfy all pre-requisites. The new order will be set as the latest manual sort.

When changing tabs in the Skill Planner search section (i.e. Skills, Certs, Ships, Modules) the search field is cleared since it's likely to not make much sense for a different kind of search.

The Database preference pane now updates properly if the database has just been updated.

Changed the way ships are sorted into races in the Ships search view so all ships should now be visible, specifically ORE ships.

The code has been cleaned up a lot to remove compiler warnings and to eliminate some memory leaks.