Issue #2085289: Commit 44b231ec broke install process because ip2country_update_database() was no longer included in hook_install().

to use country information to make default country selection on those forms.

Modify hook_install() so that it populates DB upon install UNLESS the variable ip2country_populate_db_on_install is set to FALSE.  This allows us to supress the DB loading when using SimpleTest, but still gives a good user experience because the user gets a fully-functional module when it is first enabled.

Also, minor code formatting fixes, and a minor change in the message text on the admin page.

Refactor code into admin.inc.  Make PostgreSQL fixes (#929674 by grub3 and arpeggio).  Remove ip_range_date column, as it is not used. JavaScript change - remove Drupal.isEnabled.