I realize the debian package build depends on this. Although it
probably won't break anything, I would rather implement a solution
that doesn't change the behavior of the debian installer.
With the atom atom executable now located in /usr/bin instead
of /usr/local/bin, it should always be available as part of the
system PATH. Thus hardcoding the filepath is not needed. Also, this
increase the flexibility of relocating the rpm at installation time
(not just build time) since the user or sys admin need only make
sure that the atom executable is in the system PATH and the
atom.desktop file will work correctly.
The .desktop file of Atom was named Atom.desktop but it should be
renamed to atom.desktop because a .desktop should not contain capital
letters as any other .desktop files in /usr/share/applications.
Note that without that, it can be not easy to link the window with the
.desktop file and then a dock/panel could not link a launcher with its
window.
