cleanup
javadoc
IDEA-116809 File Types: reassigned wildcard between predefined file types is not preserved upon restart
Use more reliable test data as pointed in IDEA-COMMUNITY-CR-936
Replace unittest module in mock sdk with skeleton that contains only TestCase class

Original layout of the package was preserved.
PY-14417 Use standard "package" icon for namespace packages in Python

Also directory is compared with both content and source roots because
we don't want to mark project directory itself as package. Icon for
excluded directories is not overridden.
IG: use Ref and simplify
method refs: varargs methods should be checked for parameter numbers (IDEA-133173)
do not add same method twice in call hierarchy
typo
deep delete parameter in method call hierarchy
replace unused parameter fix with safe delete in onTheFly mode: deep parameter delete is enabled this way