CB-6344: Specify after which sibling to add config-changes in plugin.xml

* refactor munges - now they are in a more extensible form (munge.files[file].parents[parent][index] { xml, count, after })
* add an after parameter to graftXML which contains a list of possible predecessor elements separated by semicolon
* fix unit tests and add new ones

github: close #68
CB-6272 Fix subdir bug + tests & meta fetch with a src directory

github: close #66
Revert "CB-6344: Specify after which sibling to add config-changes in plugin.xml"

This reverts commit ac1160d470db03c2d2de2bbd7ad0ece336cf0394.

It broke CLI's unit tests.
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