tests: tidy up reporting of skipped tests if not verbose: - print 's' rather than '.' - pass skipped test reports back to parent for -j - report which tests were skipped at the end - print '.' after test completion

adding bar
adding foo
% state dump
a   0         -1 baz
n 644          0 foo
r   0          0 bar
% status
A baz
R bar
C foo
% state dump
n 666         -1 bar
n 666         -1 foo
% status
! bar
? baz
C foo