A subsidiary of Intuit Inc. says it has an agreement to buy Roseville-based CustomerLink Systems, which provides marketing automation to a variety of industries. The agreement is mentioned on the DemandForce blog by Annie Tsai, chief marketing officer of the San Francisco-based company that is owned by Intuit. A CustomerLink blog also acknowledges the deal without a lot of detail. Intuit Inc., based in Mountain View, is business management solutions company with $20 billion in market capitalization. No…