Added getZmwMetric and listZmwMetric to zmw objects. These metrics are lazily cached; I didn't fold the productivity and read score stuff in. 

bug 21713

[git-p4: depot-paths = "//depot/software/bioinformatics/lib/python/pbcore/": change = 122534]
removed helpful action verb.

bug 21713

[git-p4: depot-paths = "//depot/software/bioinformatics/lib/python/pbcore/": change = 122535]
Add --debug, revise API slightly

I will fix tools in a moment

[Tracking bug 22690]

[git-p4: depot-paths = "//depot/software/bioinformatics/lib/python/pbcore/": change = 122546]
Version 0.6.2

[Tracking bug 22690]

[git-p4: depot-paths = "//depot/software/bioinformatics/lib/python/pbcore/": change = 122547]
Version 0.6.3

0.6.2 was DOA.  Fix ToolRunner

[Tracking bug 22690]

[git-p4: depot-paths = "//depot/software/bioinformatics/lib/python/pbcore/": change = 122552]
Use description

[Tracking bug 22690]

[git-p4: depot-paths = "//depot/software/bioinformatics/lib/python/pbcore/": change = 122555]
Remove duplicate method definitions---spotted by Jason

[Tracking bug 22690]

[git-p4: depot-paths = "//depot/software/bioinformatics/lib/python/pbcore/": change = 122559]