The code wrongly assumed that the .py file (containing source code of a
Component) was on the filesystem upon import but importing from an archive
uses tarfile and does not extract anything...

Get rid of refactoring/convention/spurious messages (ERP5 Naming Convention
may be added later on). Also, Pylint cannot deal with dynamic accessor/module
generation, so disable these error messages as well.

Also, patch pylint to handle try/except for modules imports
(https://www.logilab.org/ticket/9386).

Likewise Pylint, compile() has no side effects as it juste compile source into
a code object which may be passed to 'exec'.

Pylint should be enough and has no side effects...

and remove AccountingTransactionLine_getParentUrl which is not used

This reverts commit 5ec2f886.

While launching an new portal component test, a "Duplicate tpc_begin
calls for same transaction" error was raised. This was coming from
the finally clause in runUnitTestList, in the commit of
ProcessingNodeTestCase.unregisterNode.

After long investigations, we found out that a new app was created
while the transaction was still opened. After more investigations,
it was discovered that the runUnitTestList code was raising an
exception, and this exception was hidden by the exception in the
finally close.

So this patch provides:
1 - a cancellation of the transaction to avoid "duplicate tpc_begin
    calls" error.
2 - a print of the exception before the finally clause is launched
    to make sure we have information on possible exceptions

Base_checkPermission script API is not so nice. With it's name, we would expect it
doing checking on the object on which it is called. Instead we must give a path. This
would need to be improved. Also we will ned to clean proxification

Instead of getting all destination uids, run the search and activate with
destination_related_uid.

When MailMessage portal type is not installed, then temp mail messages will use
this class. The plan is still to remove the class, but for now just remove this
method that can overload Event.send