Removed unused parameter to "start trend;"

Added two parameters to "start trend;" command to indicate the length of
trend frames and minute trend frames in seconds and minutes accordingly.


git-svn-id: https://redoubt.ligo-wa.caltech.edu/svn/advLigoRTS/trunk@3487 6dcd42c9-f523-4c6d-aada-af552506706e