2.3
	Added an ability to fit bilinear latent space models of
	Hoff (2005).

	Bug fixes, including one reported by Soriani Nicola.

	Documentation fixes.

2.2-3
	Fixed a bug in handling of missing data, uncovered by Xiaoyue
	"Maggie" Niu, and added a test for it.

	Documentation fixes.

2.2-2
	More documentation fixes.

2.2-1
	Documentation fixes.

2.2
	Ability to fit random effects (actor heterogeneity) models.

	Removed ergmm.par class --- it has been rendered obsolete by
	changes in R's handling of partial matching in [[ operator.

	Many bug fixes and miscellaneous changes.
