Fix 256 and more#257

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crass wants to merge 3 commits intorofl0r:masterfrom

Commits on Sep 1, 2018

Fixes issue #256. If config path in envvar is not absolute, make it so.
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Commits on Sep 3, 2018

Make sure preload library path is absolute. This fixes issues where a chdir is followed by a process fork, which can cause the library to not be found.
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Make all PDEBUG calls print the PID, helpful for multiprocess applications.
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