octave: updated to 8.4.0

8.4.0

Improvements and fixes

mkoctfile: Skip parsing for less flags
Fix getting number of non-zero elements in SuiteSparse matrices.
delaunayn: Avoid erroneous simplex removal for integer inputs
delaunayn: Add precision loss warning for large int inputs
delaunayn: Also warn for negative integers with large magnitude
Correctly load all-zero sparse matrices from text files
Allocate correct storage for interleaved complex mxArray objects
mkoctfile: Prefer parsing over passing on argument after unknown argument
fft: Avoid segmentation fault with ND-arrays
fft: Avoid overwriting input for inplace operations
intersect.m: Correct third output with "stable" flag
Avoid use-after-free issue in parser
betainc.m: Improve integer input logic and validation
webread: Apply timeout also for initial connection

Build system / Tests

mkpp.m: Remove stray text causing error with demo code.
Ensure that new test for saving sparse matrices writes a text file.
Search for tests in and install octave-value template sources

Documentation

Correct variable name typo in documentation of slice().
Expand documentation for gcd() and lcm().
datevec: Clarify that heuristics are used to detect the format of a date string
datenum: Add help text that inputs can be arrays, add examples
datevec: Add help text that inputs can be arrays
Describe various pitfalls with floating point ranges
Add range example and some copyedits.

(adam)