maint: changes to follow Octave coding conventions. * NEWS.8.md: Wrap lines to 72 chars. * LSODE-opts.in: Use two spaces after sentence ending period. * LSODE.cc: Use minimum of two spaces between code and start of comment. * MemoizedFunction.m: Change copyright date to 2022 since this is the year it was accepted into core. Don't wrap error() lines to 80 chars. Use newlines to improve readability of switch statements. Use minimum of two spaces between code and start of comment. * del2.m, integral.m, interp1.m, interp2.m, griddata.m, inpolygon.m, waitbar.m, cubehelix.m, ind2x.m, importdata.m, textread.m, logm.m, lighting.m, shading.m, xticklabels.m, yticklabels.m, zticklabels.m, colorbar.m, meshc.m, print.m, __gnuplot_draw_axes__.m, struct2hdl.m, ppval.m, ismember.m, iqr.m: Use a space between comment character '#' and start of comment. Use hyphen for adjectives describing dimensions such as "1-D". * vectorize.m, ode23s.m: Use is_function_handle() instead of "isa (x, "function_handle")" for clarity and performance. * clearAllMemoizedCaches.m: Change copyright date to 2022 since this is the year it was accepted into core. Remove input validation which is done by interpreter. Use two newlines between end of code and start of BIST tests. * memoize.m: Change copyright date to 2022 since this is the year it was accepted into core. Re-wrap documentation to 80 chars. Use is_function_handle() instead of "isa (x, "function_handle")" for clarity and performance. Use two newlines between end of code and start of BIST tests. Use semicolon for assert statements within %!test block. Re-write BIST tests for input validation. * __memoize__.m: Change copyright date to 2022 since this is the year it was accepted into core. Use spaces in for statements to improve readability. * unique.m: Add FIXME note to commented BIST test * dec2bin.m: Remove stray newline at end of file. * triplequad.m: Reduce doubly-commented BIST syntax using "#%!#" to "#%!". * delaunayn.m: Use input variable names in error() statements. Use minimum of two spaces between code and start of comment. Use hyphen for describing dimensions. Use two newlines between end of code and start of BIST tests. Update BIST tests to pass.