Split the D-Bus service binaries out of their respective "libedata"
folders and give them their own folder under "services".  This just
consists of the main() function, any migration gunk, and the D-Bus
.service key file.

This provides a natural place to add a new D-Bus service for ESources,
coming soon to a repository near you!

Also, by popular demand, change the binary and source code prefix in
these folders from "e" to "evolution".  I guess so grepping a process
list for "evolution" reveals all.