Rewrite scripts to be more resilient to shells that exit immediately

if an untested command fails (see sh(1), "-e errexit").  Do this by
changing lines that look like:

	test expression && command
to
	test ! expression || command

so that the statement list always returns 0.  Also, back out revision
1.38 of pkgsrc/mk/install/install and modify the if-test to branch
correctly if +USERGROUP doesn't exist.

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