[O] emacs org mode suggestion: read org content from buffers (not files)

[Pengju Xu]

I check my agenda, all the .org files are open in buffer, agenda shows up fine

I open some buffers from network share, which then became unavailable out of home

I try to update my agenda

agenda gets empty because those files are not available 

but the buffers are available in Emacs

so I suggest to read from buffers if files are already open in buffers instead of insisting files being available 

this is my setup:

     (setq org-agenda-skip-unavailable-files t)