Rename wolfram-mathematica to mathematica-bin
mathematica-bin: Move files to new folder
mathematica-bin: Add replaces, conflicts and provides arrays
mathematica-bin: Install files to /opt/${pkgname}
mathematica-bin: Supply generic desktop file
mathematica-bin: Create symbolic links instead of copying files

This reduces the size of the package and avoids duplicated code in the file
system.
Enclose all paths in quotation marks
mathematica-bin: Bump pkgrel