[PATCH v2 1/9] msi: Add support for deleting streams from an MSI database.

[Erich E. Hoover]

msidb allows developers to remove "streams" (cabinet files) from a
database with the "-k" mode flag.  To support that feature we need
MSIMODIFY_DELETE support in the underlying MSI implementation.

Per Hans' request, this version has been updated with additional error
checking, unconditionally releasing the stream (see tests), and added
tests for the strange behavior that occurs when deleting in-use
streams.

The series has also been reordered to include all changes to msi first
and msidb support for them afterwards.

Best,
Erich