Release candidate for v1.4.0 #50

Job	Run time
--disable-hpcombi --disable-eigen (ubuntu-latest)	8m 9s
--enable-hpcombi --disable-eigen (ubuntu-latest)	8m 27s
--disable-hpcombi --enable-eigen (macOS-latest)	6m 59s
--enable-hpcombi --disable-eigen (macOS-latest)	6m 43s
--disable-hpcombi --disable-eigen (macOS-latest)	4m 34s
--disable-hpcombi --enable-eigen (ubuntu-latest)	8m 36s
	43m 28s

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