Automatically determine correct POM file location in Build Definition when checking out from SCMs like ClearCase

SCM-288 has introduced an attribute in CheckoutScmResult that contains the relative path of the project directory, relative to the checkout directory. This is needed for SCMs like ClearCase that do NOT perform the checkout into the checkout directory itself, but into a subdirectory. See SCM-288 for details.

This information should be honored by Continuum when adding a new project after checking out the sources. The POM filename of the Build Definition should automatically be set accordingly. In most cases the default "pom.xml" is sufficient, but in cases like ClearCase it would be e.g. "MY_VOB/my/project/dir/pom.xml".