Revamped runtime vs. Version number

So there's been nothing but positive feedback about the PoC revamped
runtime I asked folks on the lists to test. Thank you to everyone that did
so.

With that in mind, I think we should use that in the next version and
moving forwards, and bump the version number to 3.0 for the next release.
Does anyone object to that plan?

FYI, since the original PoC, I've made the following additional changes:

- Move to using a shared memory interlock to ensure only a single instance
(per user, per copy of the executable) is run. This means if you have
multiple copies of pgAdmin installed, they won't interact with each other,
but a single copy is limited to a single instance per user.

- Add a log viewer. If startup fails (or other errors occur), the Python
logs can now easily be viewed in the runtime.

- Tidied up the configuration dialogue.

- Added a config option to allow an alternate command to be run rather than
executing the default browser. This allows any browser to be configured,
using different profiles etc, as possible when launching on the command
line.

- Made startup more robust so config options can be corrected without
restarts if needed, and failures can be detected much more quickly.

- Cleaned up a bunch of redundant code.

--
Dave Page
Blog: http://pgsnake.blogspot.com
Twitter: @pgsnake

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