[Agda] Decidable partial orders

[Peter Berry]

I noticed the standard library has decidable total orders, but not
decidable partial orders. Implementing them was pretty straightforward
:) See the attachment. Disclaimer: I haven't tested it in any way.

I hereby release this code under the library's license.

-- 
Peter Berry <pwberry at gmail.com>
Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html
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