phpbb2drupal PostgreSQL compatibility patches.

And here is the module patch.

-Most queries with double-quoted strings in them are now using single quoted strings.
-Many inserted fields are now substr'd down to the maximum size of the column in the db table. PostgreSQL throws errors if you try to insert something too big into a table, it doesn't quietly truncate it.
-An IF in a privmsgs query has been turned into a CASE compatible with both PostgreSQL and MySQL (according to MySQL's manual anyway).
-A left join in that same query has been modified to not put parentheses around a table reference.
-A nonstandard insert which INSERTed several rows at once into profile_fields by putting commas between the sets has been broken into multiple INSERTs using a variable to hold the repeating initial part of the query.
-The insert into poll_votes was putting an empty string in the hostname field which required a value. I've modified it to write in "NA" instead.

I haven't tested this patch on mysql.

I've taken a closer look at my testing database and found the Private Message import worked without issue. That leaves the polls importing issue.