updating some datasheets and notes

* Olimex boards
* MOD-GPS (using ublox) for gps from Olimex

notes/Olimex-Notes.md

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+Olimex Notes
+---
+
+* [Olimex T2 (A20)](https://www.olimex.com/Products/OLinuXino/A20/A20-OLinuXino-LIME2/open-source-hardware)
+
+---
+
+
+Additional installs:
+
+```
+apt-get install -y libssl-dev zlib1g-dev
+
+```

notes/PIU-Notes.md

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+PIU Notes
+===
+
+###### 2021-06-01
+
+```
+# apt-get install python-tk python3-tk python-imaging-tk python3-websockets python3-websocket
+```
+
+
+