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axkr#99 Improve Context and $ContextPath handling in packages

new method IASTAppendable#appendAll(IExpr[] args, int startPosition, int

endPosition)

Issue axkr#18: Setting for disabling lazy evaluation of multiplication

see especially MainTestCase#testGithub18() test case

clean up TeX and MathML converter

Call initialization in thread

Refactor some lambda expreesions

Markdown

Fix bug in reading documentation ressources

readme.md - build fat jar