Make Summon Forest last longer, weaken dryads

The forested terrain effect was far too brief in my opinion,
though it still managed to do a fair bit of work in that time
span (since dryads were originally designed to threaten late-
midgame players). This commit extends the duration a fair bit
(and makes it scale more strongly with power), while nerfing
the damage output of dryads and their vines a fair bit in the
process. (Dryad HD also now scales with spell power.)

The longer duration actually comes with a related drawback: if
the dryad dies early, the player needs to wait a fair bit longer
to be able to recast the spell.

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