Vampires Dawn: Summoning doesn't cost soul stones

[Ghabry]

Vampires Dawn: This game only allows summoning a 4th character via a spell triggered through the spell menu. Summoning such a guy costs magic (here: blood) and an item called soul stones. The magic isn't reduced.
Probably related to #403

Summon a servant (e.g. Golem) or use a transformation (e.g. into a wolf) doesn't consume blood (resource).

Reported by Darkztar

[Darkztar]

I have to correct this bug report:

Normally a summon should take blood and soulstones. Now it takes only Soulstones and no blood.

This is very heavy in combination with #402, because after each change of the map the summon is done again and you lose every time Soulstones.