migrated some functionality to SpreadSheet::getUniqueNames
migrated functionality to Spreadsheet::getNameForID
modified createItem to accept all values explicitly in arg list.
1) migrated functionality to Spreadsheet::getRandoms 2) createItem no longer accepts top argument.
migrated functionality to SpreadSheet::selectByID
migrated functionality to Spreadsheet::selectByName
migrated functionality to Spreadsheet::clearSelection
migrated functionality to Spreadsheet::getSelectedExtent
Spreadsheet:  no new code, just moving things around and organizing into section.s
migrated functionality to Spreadsheet::getSelectedID
migrated functionality to Spreadsheet::getSelectedName
migrated functionality to Spreadsheet::getSelectedCenter
use getSelectedExtent in plantMultiTip
createBlurb now accepts explicit values instead of object.
showInfoWindow no longer accepts an attributes arg -- just references selection.
migrated functionality to Spreadsheet::getSelectedYear and Spreadsheet::getSelectedSquareMiles.
SpreadSheet:  created more property access functions
_selected variable has now officially been moved to Spreadsheet and should be local!
migrated functionality to Spreadsheet::findRecordsByState and Spreadsheet::getWIDListByState
implemented Spreadsheet::findClosest and Spreadsheet::getWIDListByClosest.  also, involved moving several helper functions under that class:  calcExtent, findBreak, and distance.