Use a different user data directory

[davepwsmith]

Making the trivial change from ~/.pandoc to ~/.scholdoc would make using both (surely not uncommon) a bit less messy, particularly in terms of templates.

[timtylin]

I believe this is already the case, introduced back in Oct with commit cec7ca73a

Does it not work for you?

[timtylin]

Possible troubleshooting:

1. Just like Pandoc, templates go into ~/.scholdoc/templates instead of ~/.scholdoc
2. Note that scholdoc uses different html and latex default templates: scholmdTemplate.html5 and scholmdTemplate.latex. If you're trying to overwrite the default template, you should target these