~flexibeast/execline-man-pages

Update to 2.9.6.0.
Update to execline 2.9.4.0.
LICENSE: Update year range.
LICENSE: Update year range.
Use `MAN_DIR` in Makefile, instead of `MANPATH`.
Reference execline.1 in Makefile.
Update to 2.9.0.0.
execline-transform.7: "Chomping" -> "Crunching".
Update to 2.8.3.0.
 Makefile:  Support DESTDIR; make default target a no-op.
man1/case.1: Update examples as per modified upstream case.html.
Correct sectioning.
Update to 2.8.1.0.
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