when checking npc faction relations, don't check against themselves

/npc help command updated

players have access to /npc info <faction tag> version of the /npc info command, this can tell them the relations of specific faction to other NPC factions, including the player factions.

audio fixes

purchased grid spawn fix for planetary trade stations, fixed surface position check

audio tweaks

- NPC ships with jump drives can jump away during evasive manoeuvres and during proximity dangers (with asteroids), jump capability is not linked to shields only.
- new provider AI tags "canTeleport" & "teleportTimer"

dereliction system added, augments NPC deaths and Unknown Signals when enabled in the config file (disabled by default)