Fixed an invalid check for duplicate ID in DBFileIO
Renamed filters to options to represent true functionality.
Updated BarcodeGenerator and LabelPrinter
Planning to update LabelPrinter using awt instead of javax.print due
to paper issue sizes.
Updated LabelPrinter and BarcodeGenerator to print to file.
Added LabelPrintable file, which implements Printable
Modifications to PackageManager to prepare to make directories.
Added a PropertyHandler class for properties.
Made changes in other classes to reflect this.
Added comments to Emailer class. 
Note that Emailer class needs a lot of work.