Imio.migrator

----------------

- Improved and simplified upgradeProfile method
[sgeulette]

----------------

- Make REQUEST available thru self.request.
[gbastien]
- Added methods `removeUnusedColumns` and `removeUnusedIndexes` to easily remove
columns or indexes from portal_catalog.
[gbastien]
- Possibility to run specific upgrade steps
[sgeulette]

----------------

- Improved reinstall method.
[sgeulette]
- Improved upgrade step to set directly rigth version.
[sgeulette]

----------------

- Added method `warn` that manages warning messages, it will display the warning
like before in the Zope log but will also store it so every warnings are
displayed togheter at the end of the migration.
[gbastien]
- Method `reinstall` may now receive paremeters `ignore_dependencies` and
`dependency_strategy` to use it when calling `portal_setup.runAllImportStepsFromProfile`.
This is only useable with Products.GenericSetup >= 1.8.0 (Plone >= 4.3.8).
[gbastien]

----------------

- Added method to run given steps of a profile.
[sgeulette]

----------------

- Display the catalog we are currently recataloging as several can be recataloged,
like in version 1.1 but this was lost somehow...
[gbastien]
- After an upgrade step has been executed, set manually new installed profile version
or despite upgrade step has been executed, it is still considered not
[gbastien]