[server] Upgrade to 16.04: PEAR not php7 compliant

Following an otherwise successful 14.04 - 16.04LTS upgrade the installed PEAR claims compatibility with php 4 & 5, but not 7.

This shows up with "PHP Warning: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback" in the Apache error log.

What can I do to get a php7-compatible PEAR installed?

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[server] Upgrade to 16.04: PEAR not php7 compliant