Helper functions for khash (patch available)

[krivit]

I've been using klib's khash for my own project, and I've written some convenience functions. I was wondering if there might be interest in incorporating them into the core implementation:

• kh_getval(name, h, key, defval): Return the value corresponding to key key, or defval if the key is not found.
• kh_set(name, h, key, val): Set the value corresponding to key key to val, inserting into table if key is absent and overwriting if present.
• kh_unset(name, h, key): A more user-friendly kh_del(): checks if key is in the table, and deletes if it is.

I would be happy to submit a pull request incorporating these.

[rofl0r]

this sounds useful. would you mind sharing your patch, @krivit ?