2014-06-17 Jesse Thaler <jthaler@mit.edu>
	* SoftDrop.{cc,hh}:
	  . Fixed bug with no z_drop
	  . added num_drop() function
	
2014-06-11 Jesse Thaler <jthaler@mit.edu>
	* SoftDrop.{cc,hh}:
	Added ability to find maximum z_drop value

2014-02-19 Jesse Thaler <jthaler@mit.edu>
	* SoftDrop.cc:
	Added explicit check for _mu = 1 to know not to use soft drop
	(needed for alternative recombination schemes to work)

2013-11-11  Jesse Thaler <jthaler@mit.edu>
	* SoftDrop.{cc,hh}:
	Added option of using a clustering algorithm that is not CA
	in order to test algorithm dependence of energy loss.  So far
	just the generalized kt algorithm with parameter p is
	implemented.

2013-10-31  Gregory Soyez  <soyez@fastjet.fr>

	* SoftDrop.{cc,hh}:
	Made SoftDropTagger recurse into the branch with the largest pt
	[instead of mt]

2013-10-29  Jesse Thaler <jthaler@mit.edu>

	* SoftDrop.cc
	* SoftDrop.hh
	Added access to z and Rg in the SoftDropTaggerStructure

2013-10-29  Gregory Soyez  <soyez@fastjet.fr>

	* SoftDrop.cc:
	if no substructure is found, return instead the "leading" particle
	[instead of an empty PseudoJet]

	* SoftDrop.cc:
	got rid of a (harmless) gcc uninitialised warning

2013-10-23  Gregory Soyez  <soyez@fastjet.fr>

        Initial creation.

	The present version is a first version of the SoftDrop. Naming may
	vary, additional features may be added, internal details may be
	fixed, so treat this as a development version!