flame blade improvement

As something interesting to do for the druids, why not
make flame blade into a more potent weapon in two
ways. First, let's come up with a way to add some fire
damage to it. My idea for this is to add a generic
weapon effect "spell" that can be used for all sorts of
different weapons. In that "spell" we add in checks for
the different weapons that we have. This could let us
wield a great deal of control over creating "interesting"
effects.

My idea for flame blade is to make it one of the best
slashing weapons available in the game, but make in
unusable by anybody besides the caster. This is already
in place, the current spell calls equip_char() which
bypasses the "WIELD" check. So just create a flame
blade without the "WIELD" flag. The druid can use it
after casting the spell, but if he removes it, it's useless,
to both him and anybody else.

Then let's up the damage of it into the HellReaper
damage range. Currently the best a flame blade can do
is average 12.5 damage. HellReaper is 16.5, so a bump
there, maybe up to about 14, and to make it +5 to hit.

Then as part of the spell effect, do a small amount of
fire damage on every swing, something in the 4-8
range. Enough so that it is "better" than HellReaper
against a mob with no resistances, close to equal
against a fire resistant mob, and worse against an
immune mob.

That was my thought for both some druid help, and a
new way to introduce advanced weapon features.