procenv 0.38 released

Written for procenv by James Hunt on 2015-08-24

* Improved error handling.
* Added CAP_AUDIT_READ capability.
* Improved build-time tests.
* Tolerate a completely empty environment.
* Fixed bug where fsid in '--mounts' output was displaying truncated output on Linux.
* Fix crasher bug triggered by specifying a UTF-8 character to '--separator' or '--crumb-separator'.
* Allow '--indent-char' to be UTF-8.

(Note 0.37 was skipped due to failing tests).

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