MAINT: avoid an overflow in rice pdf
MAINT: change von Mises support to [-pi, pi]
Revert "MAINT: change von Mises support to [-pi, pi]"

This reverts commit 024ce0b65b1e1c6c06a2345e13d317cbd5757b1f.
DOC: add a note to the vonmises docstring

Document the fact that von Mises distribution is not designed
to work as a fully-fledged distribution on a segment of a real line.
ENH: define a vonmises_line as proper distribution on [-pi, pi]

(yes, this undoes the previous commit, as discussed in the PR)
TST: mark the ncf normalization test as a knownfail
Merge pull request #2845 from EvgeniBurovski/rice_pdf

improve numerical stability of the Rice distribution