[HTTPS-E Rulesets] Private/personal ruleset location?

[J.B. Nicholson-Owens]

I have a few rulesets I use but I have no desire to upload to this list 
for others to use. Some are for private websites others can't reach, 
some are experimental and I'm working on.

Where should I put these rulesets so they'll still be around when I 
update the plugin? I am trying to avoid losing my rulesets by deletion 
or overwriting.

Is there a directory where users can put rulesets that always trump the 
rulesets in HTTPSEverywhereUserRules (should a ruleset filename be the 
same)?

Thanks.