Changes in version 1.6

Released on 2014-11-17.

Added the unittest module, a framework with which to implement
robust test programs purely in shell. This new module supports
defining test programs as a collection of standalone test cases or
test fixtures; supports assert-syle vs. expect-style checks; and
provides advanced checks to simplify the implementation of tests
cases for command-line utilities. unittest-based test programs
can be trivially plugged into the Kyua testing framework.
Added manual pages for all public API functions. See shtk(3) for
an introduction and follow all linked pages for details. All
docstrings have been removed from the code in favor of the manual
pages.
Added the shtk_config_include function so that configuration files
can source other files using relative (or absolute) paths.
Removed 'set -e' calls from shtk and from any generated scripts.
It is the user who should be enabling this feature if he chooses to
because 'set -e' may have suprising and inconsistent behavior in
large scripts (and shtk can be defined as large).

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