delaunayn simplex check consistency and performance improvement (bug #60818) * delaunayn.m: Apply consistent volume calculation across all trivial simplex removal code paths. Vectorize 3D simplex removal code path and minimize function calls within >3D loop for performance improvement. Update FIXME note for future performance improvement. Add input type validation checks. Add BISTs for dimensions other than 2D, simplex removal, and input validation. * etc/News.8.md: Describe function improvements under General Improvements.

file_encoding_TEST_FILES = \
    %reldir%/.oct-config \
    %reldir%/file-encoding.tst \
    %reldir%/test_CP1252.m \
    %reldir%/CP1251/.oct-config \
    %reldir%/CP1251/test_CP1251.m

TEST_FILES += $(file_encoding_TEST_FILES)