Listing markers in buffer

[ian.tegebo]

I see that `buffer-has-markers-at` will at least tell if there are markers 
pointing to a position, but not only has it been marked obsolete since 24.3, it 
doesn't provide one a means to actually get a marker object.

Looking at the C source, I can see that buffer to buffer_text structs point to 
a singly linked list of Lisp_marker structs, but I can't find any Elisp 
functions to access them. Also, there's a related thread from 1999:

https://groups.google.com/forum/#!topic/gnu.emacs.help/vNG9y5qCaxc/discussion

Lastly, please forgive me, I've cross-posted to SO:

http://stackoverflow.com/questions/36926513/are-there-elisp-functions-that-list-markers-in-a-given-buffer