Allow server to send any spell id
Remove server diagnostics (/serverdiag command)

It wouldn’t have been easy to port to talkactions, and was barely used
for debugging purposes.
Code cleanup
Update README.md
Update monster Doomhowl

The path to file Doomhowl.xml
Merge pull request #766 from eduardojunio/patch-1

Update monster Doomhowl
data/spells/monster
new userdata functions
Merge pull request #769 from andypsylon/spells

data/spells/monster