smokeping module: fix missing js, broken alerts

The initial commit accidentally left in some commented code and if you were
using alerts, they simply didn't work.

Smokeping also includes some JS code for the webui allowing you to zoom into
graphs and it was not passed into the homedir. Additionally, generate
static html pages for other webservers to serve the cache directory.

Add additional options to specify sendmail path or mailhost and verify that both
are not set.

Add one extra config hook that allows you to bypass all of the invidual config
stanzas and just hand it a string.