added new tests for thread
updated tests.g
added test to xRankO
added test for isnull
added not na test
updated when -> holdsWhen
renamed forall gramar part
loaded dependencies into xCompose
fixed missing infostirng
fixed dumb corner case in xCompose
added test for xOrderOf, reversed order.
added more tests.
fixed xNotNa test.
fixed minor issues, improved xAs* efficiency
added is-finite macro to xCycle
finished auditing num parametre code
made xOrderOf faster, is_na is now non-vectorised
commented splice
bumping version.
updated news.