Consolidate version logic; bump version -> 0.6.1

[Tracking bug 22690]

[git-p4: depot-paths = "//depot/software/bioinformatics/lib/python/pbcore/": change = 122415]
Add nicer __repr__ for Zmw, BasH5Reader classes

[Tracking bug 22690]

[git-p4: depot-paths = "//depot/software/bioinformatics/lib/python/pbcore/": change = 122416]
Add --profile to PBToolRunner

Now any tool that inherits from PBToolRunner gets the --profile feature
automatically.  This prints a runtime profile at program exit.

[Tracking bug 22690]

[git-p4: depot-paths = "//depot/software/bioinformatics/lib/python/pbcore/": change = 122428]
Add ZmwRead::zmw backpointer property

[Tracking bug 22690]

[git-p4: depot-paths = "//depot/software/bioinformatics/lib/python/pbcore/": change = 122443]
Add __len__ for ZmwRead

[Tracking bug 22690]

[git-p4: depot-paths = "//depot/software/bioinformatics/lib/python/pbcore/": change = 122444]
Add test

[Tracking bug 22690]

[git-p4: depot-paths = "//depot/software/bioinformatics/lib/python/pbcore/": change = 122445]
Add Zmw::numPasses property, and clean up BaxH5Reader constructor

[Tracking bug 22690]

[git-p4: depot-paths = "//depot/software/bioinformatics/lib/python/pbcore/": change = 122446]
Remove BasH5IO

[Tracking bug 22690]

[git-p4: depot-paths = "//depot/software/bioinformatics/lib/python/pbcore/": change = 122456]