bandwidth selection routines for:
unconditional densities and distributions, conditional densities and distribution, and regressions now save the total time for cross validation in member
"total.time"
added timing information to summary method
printing tweaks
added total time to summary for all remaining bandwidth objects
Merge branch 'master' into npRmpi

Conflicts:
	R/np.condensity.bw.R
	R/np.condistribution.bw.R
	R/np.density.bw.R
	R/np.distribution.bw.R
	R/np.regression.bw.R