Marabunta

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Python3!

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**Bugfixes**

* Support special chars (such as +) in Postgres passwords. The passwords were
incorrectly passed through unquote_plus, which transform the + char to a
space.

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**Bugfixes**

* Use --no-xmlrpc option when running odoo as the new web server use the same port,
it's not needed anyway

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**Bugfixes**

* Include maintenance html file in the distribution

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**Features**

* Publish a maintenance web page during migration. The host and port are
configurable with new options. By default the port match odoo's (8069). A
default maintenance is provided, but it can be configured as well.
* When a migration fails, the log alongside the traceback are logged in the
``marabunta_version`` table.

**Bugfixes**

* Commands with unicode chars make the migration fail

**Build**

* Removed python3 from tox, it doesn't run on py3 and we can't make them run
now. Odoo is still python2, py3 compat will come when it'll switch.

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**Bugfixes**

* The new connection opened in 0.6.2 might suffer from the same issue of
timeout than before 0.6.0: the connection is long-lived but there is no
keep-alive for this connection. Open a new connection for each update in
marabunta_version, which might be spaced between long subprocess operations