Memory Leak when generating map

Description

There seems to be a fairly serious memory leak when generating maps.

Steps to replicate:

- Set SE5 to windowed mode
- open task manager, set to processes tab, find SE5.exe in the list

- select new game
- select standard se5
- select large # Note that i'm assuming it does in all sizes but large makes it easily visible
- select cluster or mid-life # Again assuming it works in all types but have seen it happen directly in these two
- press generate map
- wait for map to generate
- if using task manager, note mem usage of se5.exe
- repeat last 2(or 3 if using task manager) steps
- you'll know when you've run out of memory when generate no longer creates all of the warp point links that you'd expect. Closing the game after this point will cause a crash.

With Large/Cluster as settings i get a mem usage increase of between 20-40meg(roughly) per "generate map".