Starting work on logging admin lockouts for #859.
Formatting locked out admin log string and getting IP address correctly using get_ip().
Fix: Length of guest usernames not checked, refs #836

* inc/datahandlers/post.php
  * added verification of username for guests input using user datahandler
* newreply.php / newthread.php
  * added verification of username for preview
* inc/languages/english/datahandler_post.php
  * added language strings for possible error messages in post author validation
Merge branch 'feature' of https://github.com/mybb/mybb into feature-859-log-logout-failures
Removing space after typecast.
Started working on stop forum spam checker class.
Decoding result from SFS.
Merge branch 'feature' of https://github.com/mybb/mybb into feature-860-check-sfs-on-register
Merge branch 'feature' of https://github.com/mybb/mybb into feature-859-log-logout-failures
Simplifying log display.
Merge branch 'feature' of https://github.com/mybb/mybb into feature-860-check-sfs-on-register
Working on StopForumSpam integration.
Fixing comments in checker class.
Fixing install XML formatting.
Merge branch 'feature' of https://github.com/mybb/mybb into feature-860-check-sfs-on-register

Conflicts:
	install/resources/settings.xml
Adding plugin hook when checking against SFS, adding settings for the different checks and adding missing lang strings.
Fixing settings order and checking for error in API response.
Using the stopforumspam_block_on_error setting.
Working on adding Peekers.
Merge branch 'feature' of https://github.com/mybb/mybb into feature-860-check-sfs-on-register