Add ability to select a set of changes to unshelve

In the latest MercurialEclipse 2.7.2, a shelve operation does not allow the user to select which of the shelved sets of changes they want to unshelve.

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On a dirty project, use the Shelve dialog to shelve two (or more) different sets of files so that the working directory is clean.
On the clean work dir, click the Unshelve button, then OK in the dialog that opens.
An unshelve of the latest shelved set of changes is performed without any questions to the user.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information