Empact scripts and ECHO

updated these scripts to accept a simple start date and end date.

I have also added a script (and data, too!) for the Proctor Maple Research Center

Basic scripts:

• Colchester Reef
• Mansfield West
• Diamond Island
• Proctor maple

Referenced as-is, they return the last 24 data points for each station.

Optional parameters:

    n_points   :  return this many data points
    date       :  return data for this day
    date1
    date2      : used together to bracket a start date (date1) and end date (date2)
    skip       : skip every skip points

Examples

    http://www.uvm.edu/~empact/data/pmrc.php?n_points=96
    http://www.uvm.edu/~empact/data/pmrc.php?n_points=96&date=2005-01-01
    http://www.uvm.edu/~empact/data/pmrc.php?n_points=960&skip=96
    http://www.uvm.edu/~empact/data/pmrc.php?date1=2006-03-24&date2=2006-03-31