Remove a condition where the login delay feature could cause a denial of service, consuming all web server resources.

[#493164]

#316739 - login attempts message always the same (fix was to support IPv6 in the tracking table) by deekayen
fix tokens replaced with blank strings in the email notification to admin uid 1 by removing redundant $variables call that just unset the correct replacements
coder notices cleanup

coder module cleanup at the minor level and support to display the last login and page access on login

All patchs applied and working.
Fixed pot file.

blank IP address being populated in the placeholders.. also being used to create the blocking access rules.  Thanks to Veldar, again!

Finally I've fixed the annoying message after successfull login. The module is working well after several tests, and the code is clean enough to talk about an official release now.

Finally the module allows to show remaining attempts as desired by Christefano. I've improved the placeholders information for the messages. The module is also tested enough to be released as official release, but I'll wait to meet Christefano's requeriments before tagging.

Modified to not distrupt the user flow. Now when a user is blocked, the user hook: updated is launched, so other modules may react to this.

New configuration options, to allow the translation of module strings.

Initial commint of login_security module. This module will add a few options to the login form to improve it's security configuration