Revert "silver has a weight of 1: http://bugs.eressea.de/view.php?id=2013"

This reverts commit 911992b04dd8eebab70d87993dd2b71dc8cb12f8.
fix MAKE TEMP, for real this time. I hate skip_token and all that stuff.
fix null-pointer crash.
Merge branch 'version-3-1'

Conflicts:
	src/laws.c
use full path to preview script from cron.