Remove extra linefeeds and tabs from assRow()'s output.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5162 2fea6a4d-a838-0410-917b-93a53c48e9d2
assRow() wipes the width.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5163 2fea6a4d-a838-0410-917b-93a53c48e9d2
Give assRow() a lift job.

Define $o, give variables proper names indicating the
purpose.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5164 2fea6a4d-a838-0410-917b-93a53c48e9d2