NO-JIRA: Fix to work with older help2man and cmake

Add --version option to tools, older help2man lacks --version-string
Add explicit paths in CMakeLists, older cmake doesn't default to BINARY/SOURCE directories.

"make check-man" is now an optional step, troublesome to automate as there
are spurious differences due to different versions of help2man etc.

git-svn-id: https://svn.apache.org/repos/asf/qpid/dispatch/trunk@1644340 13f79535-47bb-0310-9956-ffa450edef68