New datamodel. Now Configs has Users ancestors and Resulrs are children of
Configs.

	modified:   checker/check.go
	modified:   checker/data.go
	modified:   checker/main.go
	deleted:    checker/notes.txt
	new file:   index.yaml
	modified:   media/js/scr.js
Store all compared web page source. Send email with attachment containing
two different page versions.
Files:
	modified:   checker/check.go
	modified:   checker/data.go
	modified:   checker/main.go
	modified:   templates/index.html
Report errors on email. Errors on one check does not break others checks.
Fix error when check page was called from cron with no current user.
Merge branch 'master' into work

Conflicts:
	checker/check.go
	checker/data.go
	checker/main.go
	checker/notes.txt