Updated author list
Added tracheal tube seed and radius parameters

Reorganized order of parameters somewhat.
Moved some functions into separate source files

This should make development easier.
Write the final threshold to a text file if debug is enabled
Added explicit boolean options

Added these for adding fragments and removing the trach
tube.
Improved XML names
Added masking of tracheal tube out of original image

This is needed for the ppolygonal geometry extraction step.
Added dilation parameter for tracheal tube object

This is meant to make up for any undersegmentation of the
tracheal tube. Want to keep this parameter as small as
possible.
EOL change