updated ipython notebook format to work with nbformat == 4
inline: restore braces when needed (IDEA-132946)
introduce variable: common api (IDEA-94609; IDEA-125286; IDEA-131965; IDEA-131930)
updated ipython output cell notebook format to work with nbformat == 4
Merge remote-tracking branch 'origin/master'
productivity guide entry for adding carets using DoubleCtrl+arrows
removed cacheOrGet
use interface where possible
instantiate ConcurrentHashMap via factory only
file type test
instantiate ConcurrentHashSet via factory only
use more specific map
Breadth-first to show minimal-length leak path