test.py should report a useful summary

[ramou]

Tentatively, I want:

• Number of descriptor directories with all tests passing over number of tools considered (test.py indicating a descriptor directory)
• For those without everything passing, list them, and under each show:
  • number of descriptors with all tests passing over total
  • number of descriptors without tests (warning)
  • for descriptors with failing tests
    • number of tests passing over total of tests
    • list (on one line) the names of the failing tests

This might look something like

... 
<all the test results in full above here> 
+All tests passed in 7 of 8 tool directories
    For ncbi-blast/2.7.1:
+     2 of 25 descriptors validated and passed tests
       22 descriptors did not have any tests
         For makeblastdb:
+          1 of 3 tests passed
-          The following tests failed: uploaded_archive, missing_archive