imv.glm.rmvar() has been renamed to imvglm.rmvar(). The old name looked
like an S3 method for the imv generic on a non-existent glm.rmvar class.
imv.binary() arguments renamed: y → m0, p1 → m1 for consistency
with the imv S3 generic. Callers using positional arguments are unaffected.
imv() is now an S3 generic. Methods are available for glm, glmerMod
(lme4), and SingleGroupClass (mirt) objects. An imv.default method
accepts a custom predict_fn for unsupported model types.imv0glm() and imvglm.rmvar() are now exported and documented.testthat test suite.