Allow pager queries to spread multiple lines

This patch enables pager_query() sql to span multiple lines, which is my preferred way of writing long sql queries as they're more readable. Without this patch, those using multiline (as in with line breaks in them) sql will find that theme_pager() returns the wrong number of pages.

This patch just solves this issue for pager_query, though there may be many other places in the drupal code where multiline sql isn't supported. Indeed, Drupal coding style says to keep sql to one line. But for usability, I believe the coding style should be changed.

The patch simply changes two . in a preg_replace to (.|\n) to enable line returns to return true as well.

before:

$count_query = preg_replace(array('/SELECT.*?FROM/As', '/ORDER BY .*/'), array('SELECT COUNT(*) FROM', ''), $query);

after:

$count_query = preg_replace(array('/SELECT(.|\n)*?FROM/As', '/ORDER BY (.|\n)*/'), array('SELECT COUNT(*) FROM', ''), $query);