Create child folder objects using parent context for real

We activate the user for the context using the root folder
context as there are times where the active user is not
matching with the one stored in the application context
and SOGo object is storing cached data with the wrong user
leading to create folders in wrong mailboxes, etc.

As this application is single-threaded, no problems are expected.
Indeed, the same code is available at getting the root folder (ie INBOX).
Merge pull request #65 from Zentyal/ejhernandez/fix-folder-other-users

Create child folder objects using parent context for real
oc: Guess recipients from some properties while importing PST

This is happening when importing a PST file.

From -> PidTagSenderEntryId
To   -> PidTagOriginalDisplayTo
CC   -> PidTagOriginalDisplayCc

The tested EntryID are the local users and OneOffEntries
when the users are not from the directory.

It requires https://github.com/openchange/openchange/pull/175 to work.
oc-rtf: fix parse \pict tag with \bin data
Merge pull request #67 from Zentyal/jgarcia/rtf-with-pict-data

Parse \pict control word with binary data
Merge pull request #66 from Zentyal/ejhernandez/guessing-recipients-from-import-PST

oc: Guess recipients from some properties while importing PST
oc: ignore unhandled properties instead of abort

When setting a row with properties not handled right now, ignore them
like they were never there instead of abort()
Merge pull request #69 from Zentyal/jgarcia/ignore-unhandled-properties

Ignore unhandled properties instead of abort
Merge branch 'master' into trusty