Add new setting to Advanced->Confirmations

Added new setting "Apply stashed changes after successful checkout" to Advanced->Confirmations in the Settings dialog.

Fixes Issue #40
Merge pull request #42 from rthorp/fix/NewSetting

Add new setting to Advanced->Confirmations
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Correction as per comment to PR#43.
Merge pull request #43 from gitextensions/jb/update/2.47

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Version updated to 2.47
Merge branch 'release/2.47'
Set version to 2.48