PEP-594 is deprecating a bunch of modules. As part of the cleanup, we
are also dealing with long deprecated modules, functions and aliases.

* `assert_` -> `assertTrue`
* `assertEquals` -> `assertEqual`
* `assertNotEquals` -> `assertNotEqual`
* `assertAlmostEquals` -> `assertAlmostEqual`
* `assertRaisesRegexp` -> `assertRaisesRegex`
* `assertRegexpMatches` -> `assertRegex`
* `base64.encodestring` -> `base64.encodebytes`
* `base64.decodestring` -> `base64.decodebytes`
* `inspect.getargspec` -> `inspect.signature`
* `inspect.formatargspec` -> `inspect.signature`
* `logging.warn` -> `logging.warning`

closes odoo/odoo#36863

Task: 2003936
Signed-off-by: Raphael Collet (rco) <rco@openerp.com>

Multi is the default api for methods, it is not necessary to explicitly
decorate methods with it, adds clutter and most people use it because
they see that the rest of the code uses it.

Done with `find . -type f -name '*.py' | xargs sed -i '/@api.multi/d'`

The old tree views don't really exist anymore, this odd pseudo-flag to
dispatch between "list" and "tree" tree views has no reason to remain.

Task 1937686

closes odoo/odoo#31243

Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>

Currently, when trying to import a module, if there is an error
related to dependencies, it is not shown in a decent format. For
example, technical names of the modules are being displayed in
a single line, separated by comma.

This commit makes the dependency error message readable by
displaying short description of the modules (instead of
technical names), each on a new line.

task-1830483

closes odoo/odoo#33029

Signed-off-by: Martin Geubelle (mge) <mge@openerp.com>

Check that it makes custom binary fields into attachment as that's the
main reason for the change: when users create binary fields via Studio,
they're necessarily db-stored (as the interface doesn't allow altering
the attachment attribute and it's unclear how we'd handle users
switching it on/off every time), which significantly bloats their
database (and burns storage & backup space), especially as the primary
use case for binary fields is adding images and documents to records.

* check that binary fields are properly created as attachment=True
* add attachment=False on fields where that seems relevant (most but not
  all of the fields previously using the default)
* remove occurrences of attachment=True

closes odoo/odoo#29308

Let 2015 be a year without modelines!
cf #4174

Will force --init mode even if module is already installed