Agenda: Specify entry types as an option

Agenda: Specify entry types as an option

Patch by Matt Lundin

Matt writes:

> Below is a patch I've been using to speed up the construction of
> agenda views limited to certain types of entries (e.g., timestamps and
> sexps).  Previously, I had constructed "calendar" views consisting
> only of timestamps and sexps by using the variable
> org-agenda-skip-function to exclude scheduled items and deadlines from
> the agenda. This, however, proved somewhat slow (3-4 seconds for
> weekly calendars, 10-12 seconds for monthly calendars). The patch
> below cuts the times to 1 and 3 seconds respectively. I believe it
> provides an efficient alternative to the skip function by allowing the
> user to tweak the arguments passed to org-agenda-get-day-entries.