'Ignore variables used in tuple unpacking' setting for unused local
inspection is turned off by default.

The commit reverts source root order respect for import statements thus
reopening PY-28321. The reason is that until pkg_resources and pkgutil
namespace packages are not implemented (see PY-16688, PY-23087) the
original fix leads to false positives in projects relying on this
functionality.

As soon as namespace packages support via pkg_resources and pkgutil will
 be implemented the change should be reverted back to close PY-28321.

instead of using artificially built indentation. It also covers all
collection literals, comprehensions and glued string literals in
parentheses most of which were overlooked in the previous implementation.

IDEA-189391

IDEA-189427: consistency with simple casts

method references by second search would be called on lambda parameter so should not influence constant checks

fixed case with removing association first

We used to put all changes into mappings in worker from ChangeListUpdater,
even if there are a partial tracker registered for this path.
As such changes are not included into myChangesBeforeUpdateMap mapping,
they are always mapped into default list.
If the tracker was released during the CLM update, we would use changelist
from updatedWorker - and move file into default changelist (instead of
the one, that was assigned to this file in `unregisterChangeTracker`).

There is still an issue, if the tracker was registered, modified
and destroyed during the update (so updatedWorker knows nothing about it).

so that binding.hasVariable("<name>") can be avoided, because a simple null check suffices

IDEA-189387 Pycharm 2018.1 won't start after patch update
IDEA-122925 IntelliJ Fails to apply IDE update patch due to faulty "IOException: No Space Left on Device /tmp"
IDEA-162267 Update requires excessive disk space
IDEA-167297 After broken update can't run pycharm
PY-15478 Error when applying patch 4.0.6 and now can't start PyCharm

Java: Highlight overwritten assignments of fields in constructors and class initializers (IDEA-189351)