Changes in version 0.0.3                        

    o   Function splinetree added for partitioning unpenalized or parametric spline 
	models.

    o   Score-based conditional inference tests can now be used to fit smoothing-spline
	trees. This much reduces computational load. Function gamtree allows to choose
	between use of model-based recursive partitioning (method = "mob") and 
	conditional inference trees (method = "ctree").  

    o   Although the previous implementation of gamtree was functional, the parameter 
	stability tests were based on the 'wrong' derivatives, leading to
	bad overfitting behavior. The current implementation of gamtree has 
	more limited functionality, but uses proper derivatives for testing 
	stability of smoothing splines. It employs gamm4 to fit the GAMs, which
	provides a full mixed-effects specification of GAMs. It employs merDeriv
	to obtain valid derivatives or scores. The function is now much slower, 
	but should yield accurate subgroups and exhibit much less overfitting.

                        Changes in version 0.0.2                        

    o   Many bug fixes, including: 

    o   Offsets now correctly passed between tree and GAM, which earlier 
	 version did not, yielding no changes of improvement when joint 
	 estimation was performed.

    o   Improved argument passing to functions gam() and bam(). 

    o   Function gamtree now supports fitting with gam() and well as bam().

    o   Improved plot, coef and predict methods.

                        Changes in version 0.0.1                        

    o   First development version, available from github.