Simplify Options::setDescription() usage

Remove the need for all tools to call concatenateStrings() to pass the
description to Options::setDescription().  In addition to marginally
simplifying the calling code, this allows more elaborate processing of
the input array to fix issues that there currently are, e.g., with
descriptions that include significant leading spaces in the input
strings.  Not done in this change, though.

Change-Id: Ibe295d5e578222c43f01c1248989d119aa60f0bd