Remove unused fields.
NotNull
IDEA-127739 Navigation Tab
"Project disposed" exception
Cherry-picked static call hierarchy for Python from novokrest/intellij-idea:master
Get referrers refactored a bit.
Merge branch 'python-call-hierarchy'
Merge remote-tracking branch 'origin/master'
Merge remote-tracking branch 'origin/master'
cleanup
IDEA-127191 "can't find tag for interface org.jetbrains.idea.devkit.dom.ExtensionPoint" thrown by 'Analyze Dependencies' action
Exception breakpoint should be added with notify on terminate by default.
Merge remote-tracking branch 'origin/master'
testdata for IDEA-126778
new inference: standalong check with cached data (IDEA-128982)