Make tracking opt-in.

Plus the article posting halts when Textpattern.com does
not respond in timely fashion.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5678 2fea6a4d-a838-0410-917b-93a53c48e9d2
Keep commenters' emails private by default.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5679 2fea6a4d-a838-0410-917b-93a53c48e9d2
Increase artificial URI length limit.

'nice try.'

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5680 2fea6a4d-a838-0410-917b-93a53c48e9d2