Add days-in-past to keep the remote calendar clean.

[whirm]

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Also clean up mixed tabs and indentation.

Original "days in past" commit author: Martin Kaffanke <m.kaffanke_at_gmail.com>

After/if this PR gets merged I've got some more changes I've collected from various forks (like vtodo support) cleaned up so they apply on top of this.

[dengste]

Thanks for your work. I'm usually opposed to commits only containing tab/whitespace changes because IMO it's a non-issue and makes git-blame more tedious. Are these really necessary?

[vanicat]

Problems with indention some time render the code difficult to read. It make this code more difficult to correct and improve that it should be.

[dengste]

I what way is the code difficult to read? Because of the tabs? If so, then you deliberately changed the defaults for Emacs-Lisp mode. Leave 'tab-width' at '8' and everything will be fine. If you look at the Emacs code base, you will see that there's also a wild mixture of tabs and whitespace. It's really a non-issue unless you change 'tab-width' or otherwise make tabs explicitly visible.

[vanicat]

Okay, sorry, I wrote my comment based on memory, and i cannot find in the current code the problem I had in mind. I should have checked before writing my comment.

[whirm]

I've rebased against current master and fixed @vanicat's comments. I've removed the white space cleanup commits from this PR for now and I'll see if it makes bringing in other changes not too annoying.