Use calculated version numbers in AssemblyInfo

[rmunn]

The AssemblyVersion attributes for LfMerge.exe (and perhaps other parts, but at least the .exe) should be set up to tag it with an appropriate version number so that I can easily figure out which version was deployed by simply looking at the .exe. (Note: on Linux, exiftool of all things is able to read the Windows .exe format and print out its metadata, so it would be quite nice if exiftool LfMerge.exe | grep Version printed out 2.0.115.)

I also want to be able to tell which DatabaseVersion a particular assembly was compiled for: somewhere in the AssemblyNameAttribute I want to print LfMerge-7000072 or some such.

Will write up a more detailed design when I get around to this issue.