pear-core: PHP 7 and unit tests

Hi, PHP 7 will deprecate a couple of things that PEAR core relies on. A list has been collected at http://pear.php.net/bugs/bug.php?id=20488 We can't keep compatibility with PHP 4 anymore, so we've decided to bump the minimum version to PHP 5.4, which is what all current stable distributions ship. ("we" is me, Ken Guest and Ferenc Kovacs[tyrael]). To prevent breaks when fixing the rest of the PHP 7 problems, I've taken the time and fixed all unit tests. pear-core branch "stable" is now running without failures on travis: https://travis-ci.org/pear/pear-core/builds/49707653 -- Regards/Mit freundlichen Grüßen Christian Weiske -= Geeking around in the name of science since 1982 =-