[TYPO3-core] RFC: #14396: Warn when KEEP_FILE is set

[Steffen Kamper]

Hi,

this is SVN patch request.

Type: bugfix

Branches: trunk

BT reference: http://bugs.typo3.org/view.php?id=14396

When the ENABLE_INSTALL_TOOL file contents "KEEP_FILE" it won't be deleted.

Show flash message in setup when this is set.
Disable the delete button (submit would create an error)

vg Steffen
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