Merge pull request #3 from a0x77n/dev

Fix for CFG unit-test.
Add sphinx domain for joern.
Start documentation with the joern domain.
Add file for documenting joern nodes.

This is only for testing purpose.
Merge pull request #4 from a0x77n/docs

Sphinx Joern Domain.
Added tests for UDG from joern-core.
Test cases for improved pointer/array handling.
New test case.
Added test for parsing of new operator.
Removed duplicate definition of 'functions'.
New lookup function: getFunctionsByFileAndName
'getFilesByName' introduced.
Moved node-hiding-compatible lookup steps from joern-tools into python-joern.
Pass the symbol that is currently checked into sanitizer descriptions of unsanitized.
Minor fix to _cfgPaths.
Fix for getCallsTo for C++ method names. Slight optimization for 'unsanitized'.
Added interprocedural steps. Requires some more testing, though.
More interprocedural analysis.
Removed debug message.
Fixes for new interprocedural steps.