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.
segmentation fault caused by new getstrtoken semantics
segmentation fault
simple tests for build().
cleaning up the code to give it a common setup function.
change the golem code to use flag, not hard-coded race.
unify the golems, make code more readable, kill a block of unused code.
Merge branch 'master' of https://github.com/eressea/server