ticket:10 add logging model to app
ticket:10 add migration
ticket:10 add admin page for Log model
ticket:10 add test for signal processor
ticket:10 fix testcases typo
ticket:10 add logging realization

on local PC it causes tripling log records if tested with all test
classes loaded
ticket:10 use absolute (not relative) import

use about.models instead of .models and so on
this removes tripling of logging; now log records are just duplicated
ticket:10 add checks for duplicate lines in log
Merge branch 't10_signalprocessor'