[MDEP-437] Create symbolic links instead of physical copies

**[Markus Karg](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=mkarg)** opened **[MDEP-437](https://issues.apache.org/jira/browse/MDEP-437?redirect=false)** and commented

When copying lots of resources, especially huge ones (e. g. we are dealing with two gigabytes (!) split up into several 100 MB large binaries) it is tedious to wait until the copy task has performed real physical copies...

Since JRE 7 Java (which is public for years meanwhile) can deal with symbolic links, it would be really cool if one could add a \true\ configuration option, so the plugin could simply go the fast lane and use symbolic links instead of physical copies.

For backwards compatibility unfortunately the default has to be "false". :-(

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**Affects:** 3.1.2

**Remote Links:**
- [GitHub Pull Request #87
](https://github.com/apache/maven-dependency-plugin/pull/87)

Start by reviewing the linked GitHub Pull Request #87 and the Maven dependency plugin code it changes. Verify how the proposed symlink option is configured, how the default preserves physical copying, and whether the PR includes coverage for both behaviors.

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