Task 853: Testing of difference tree building with different variants of source trees

See #14, release log:

• 35584af by @rultor: Merge branch '__rultor'
• 18c7f43 by @kniazkov: Insertion parsing + tests
• 7c07685 by @kniazkov: + test
• afe020b by @kniazkov: + test
• cfcec42 by @kniazkov: + test
• 9300106 by @kniazkov: + test
• 189a0a8 by @kniazkov: + test
• ef6dbc5 by @kniazkov: Fix Qulice warnings
• fb762c9 by @kniazkov: Testing tree containing insert...
• fac47fa by @kniazkov: 'addNodeAfter' method
• 51259c9 by @kniazkov: 'Insert' action
• 5531451 by @kniazkov: A little optimization.
• 0dbbde9 by @kniazkov: Fix Qulice warnings
• 866b577 by @kniazkov: Fix traversing order in the ma...
• 21c60e6 by @kniazkov: Difference tree builder suppor...
• ff9b06b by @kniazkov: Replace action
• 2657c5a by @kniazkov: Testing the construction of a ...

Released by Rultor 1.76.3, see build log