if user removes sth, ask him on quiting about VACUUM and if he likes that do it (sqlite docs say it can take sometime one large db (I cannot test, YANN?) and it is why I do not do it automatically; also fix a bug on massively deleteing contact logs

you can now delete one of more contact logs from database. all should work (else it is a bug) apart from searching which is coming soon

this is a copy of the original, so it should
work

still there are several TODOs

pychecker this file and fix also to adhere to coding standards. Travis please have a look at this commit