IDEA-99080 Incorrect Groovy stubs generated by IDEA in case of varargs and default named arguments
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[vcs] IDEA-99093 Make the list of unregistered roots scrollable

* Add the list to a JBScrollPane.
* setMinimum and Maximum sizes not to let it shrink to zero because of the GridBagLayout.

Remaining problem: when the dialog is enlarged, at some point the scroll pane dissapears (when the dialog is high enough) and the list of unregistered roots gets bigger.
[vcs] VcsDirectoryConfigurationPanel: DRY GridBag configuration.
[vcs] VcsDirectoryConfigurationPanel: no need to be a PanelWithButtons because there are no buttons, make it JPanel