PKGBUILD updated for 2020-a

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+# MATLAB: Archlinux integration
+
+This PKGBUILD creates an Arch Linux package for MATLAB
+Additionally; it also builds python engine.
+
+***WARNING***, this package NEEDS you to obtain the files; as the files are too large to host elsewhere.
+
+## Tips
+
+* You probably want to run this locally; since the package will be large.
+If you are managing your own repos; depending on bandwidth and size constrants;
+exclude this package from your workflow.
+(Partial install is around 8 GB; and full install about 16 GB)
+* Turn off compression if this package will only be installed on the build machine;
+this cuts a fair amount of time from the build and compression is unneccessary on local machines.
+
+# Requirements
+
+Besides the dependencies; the source files MUST be present at the directory.
+The user MUST supply;
+
+* **matlab.fik**: Plain text file installation key
+* **matlab.lic**: License file
+* **matlab.tar**: Software tarball
+
+Then run `makepkg -s` from the PKGBUILD directory to build the package.
+
+## File Installation Key & Licence File:
+
+[Here is the current link to the instructions](https://www.mathworks.com/help/install/ug/install-using-a-file-installation-key.html)
+
+File installation key identifies this specific installation of matlab.
+The license file authorizes that this key can use the toolboxes.
+Follow the steps;
+
+* Go to [License center](https://www.mathworks.com/licensecenter) on mathworks
+* On install and activate tab; select (or create) an appropriate license
+* Navigate to download the license file and the file installation key
+* Download the **license file** and put the file in the repository
+* Copy and paste the **file installation key** in a plain text file
+
+## Tarball
+
+**To run the installer, libselinux is needed!**
+
+* [Download the matlab installer](https://www.mathworks.com/downloads)
+* Unpack and launch the installer
+* After logging in and accepting license; select
+`Advanced Options > I want to download without installing`
+from the top dropdown menu.
+* Select the toolboxes you want in the `PKGBUILD`.
+(Alternatively install them all)
+* Download the files to an empty directory called `matlab`
+* After downloading; from the parent directory; do
+`tar --create --verbose --file matlab.tar.gz .../matlab`
+to create the tarball.
+
+# Tips
+
+## Large files
+
+To transport large files in fat32 media (most flash drives); use split and cat;
+* **Split**: `split --bytes 3G --numeric-suffixes=0 matlab.tar.gz matlab.tar.gz.`
+* **Concatenate**: `cat matlab.tar.gz.* > matlab.tar.gz`
+
+## Modules
+
+Matlab comes with a [lot of products](https://www.mathworks.com/products.html).
+Most are not needed; check PKGBUILD to pick and choose appropriately.