#1130: improve using variable FAIL_ON_AMBIGOUS_MERGE incl. documentat…

[hohwille]

fixes #1130
improvement for PR #1138

• improve using variable FAIL_ON_AMBIGOUS_MERGE
• add documentation
• add test
• follow best-practice to have test (XmlMergerTest) in the same package as the tested class (XmlMerger)
• also renamed the package com.devonfw.tools.ide.merge.xmlmerger to com.devonfw.tools.ide.merge.xml following DRY principle.

[coveralls]

Pull Request Test Coverage Report for Build 13999873361

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.07%) to 67.738%

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Totals
Change from base Build 13998949209:	0.07%
Covered Lines:	7838
Relevant Lines:	11144

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💛 - Coveralls