I currently have two "general" Google accounts. I set up the first several years ago to use stuff like Calendar, Contacts and also Analytics. I didn't want to use it for e-mail, as I already have an e-mail address and I didn't want to migrate everything to Google. So I used just some "random" user name like user87142 for it. Recently, I set up a second account to use it for a project on Google Code, as I wanted to have some meaningful user name there. After a while, I started using this account for other purposes, like signing up on Github, Discourse and also added it as another login option here on Stackexchage.
Well, now I have the problem, that I have two "active" accounts, which gets quite confusing. Sometimes, I have to log in using the other account to check something (for example, Analytics), then I have to go back to the other to sign up for some website. I know you can log in with multiple accounts on Google, but I'd rather have just a single account. And I don't really want to loose my calendars and contacts or have to set up Analytics again.
According to Google's Help pages, it is not possible (yet?) to merge two accounts directly. However, if you search for this topic, there seems to be a tool called 'Google Takeout' for merging two Google+ accounts.
Now my question: is it possible to use that tool for merging two 'normal' Google accounts too? If yes, what are the steps you have to perform, what things could go wrong? If no, is there some other way of 'merging' my accounts?