PostgreSQL support

There are additional problems in spam.module itself, it seems. In PostgreSQL, ' and " have different meanings, and you use " (which is used in PostgreSQL for selecting columns) when you generally need to use ' (which is used for specifying a string).

Unfortunately, fixing this is going to be somewhat tedious, since these characters are generally embedded in another string... which used the opposite style of quote to begin and end, and thus must be reversed as well.

Great progress has been made, but it's not completely fixed yet. I was able to successfully mark a number of comments as not spam, but when I tried changing the status from not spam to spam on one of the comments as a test, I got:

user error: query: SELECT * FROM spam_tokens WHERE probability > 80 AND token LIKE "URL%%" ORDER BY token ASC LIMIT 25 OFFSET 0
warning: pg_query(): Query failed: ERROR: column "URL%%" does not exist
user error: query: SELECT COUNT(*) FROM spam_tokens WHERE probability > 80 AND token LIKE "URL%%"
warning: pg_query(): Query failed: ERROR: column "URL%%" does not exist

The attached patch seems to clear up the last problems.

Thanks for looking into this so quickly.