Due to the split up of the property sheets, the install projects did not
have info on the Intermediate and Output Paths, which caused confusing
messages from Visual Studio to show up upon completing build+"install" and
closing Visual Studio on whether to reload the install project, at least on
Visual Studio 2008.
Include the property sheet which defines these properties to fix this.
Split the property sheet into four sheets, to make maintainance of the
build files easier, and also to prepare for using autotools to fill in
the parts for the "installation" of headers.
Also put more of the items that are repeated in the projects into the
property sheets, also to improve ease of maintenance.
Updates to the Visual Studio 2010 projects will come later, as the script
to update them to Visual Studio 2012 must also be taken into account during'
the process.
