Test quilllapp/config.tcl

This commit adds quillapp/config.test; but it also adds a mechanism for
setting the configuration during testing, which will be key to testing
the various tools.
Verbose output

Added a global -verbose option, to enable verbose output.  The
"verbose" command queries the flag, and the "vputs" command outputs
text to the console only when "verbose" is true.
'quill test' summarizes results

When 'quill test' is used to run all test targets, it summarizes the
results.  If there's an error in a test file, the error is noted and
the user is told to use 'quill -verbose' test to see the details.