Listing traditional tests (#1)

* Adding formulae for spike and gradient

* Adding @catsch to contributors

The contributors session need some thinking on how to organize it, but
adding @catsch now anyways so we don't forget it later.

* Moving tests session into src

All source code for the document should be organized inside src.

* Fixing identation with spaces

* Adding digit rollover

* A reminder for global range

* Argo's spike for nitrate

Adding a note here so we don't miss the comments from @catsch.

* Moving tests to AsciiDoc

While we don't decide which one to use, let's stay consistent.

* Including tests section into main document

* Initiating section procedures

* Fix: Spike - median

Thanks to @callumrollo

* Adding DOI for BGC nitrate QC

Thanks to @callumrollo

* Improving bibtex record

src/RealtimeQC.adoc

@@ -1,4 +1,5 @@
 = Realtime Quality Control for Underwater Gliders
+:stem: latexmath
 
 == Credits
 
@@ -31,6 +32,18 @@ The methods described here augment the original data to guide the user on the de
 Real-time QC is commonly associated with automatic checks, which indeed better suit the fast response requirements for a real-time data stream, but it should not be limited to automatic procedures. One of the distinct characteristics of underwater gliders is the close monitoring from pilots and scientists as frequently as hourly to at most every couple of days. 
 Complex cases, otherwise missed by the automatic procedures, but identified by the operators should be flagged and updated in the data stream. With the assumption of a low rate of mistakes by the automatic procedure, it is best to do not hold the automatic procedure for manual confirmation, but employ a fast automatic assessment and stream a posterior correction when necessary.
 
+include::tests.adoc[leveloffset=+1]
+
+== Procedures
+
+==== Argo BGC
+
+9. Spike test (median)
+
+Red Sea and Mediterranean Sea, flag 4 if test value > 1 micromole/kg
+
+Other places, flag 4 if test value > 5 micromole/kg
+
 == History
 
 Virtual synchronous meeting on XXX.
@@ -73,6 +86,14 @@ Participants:
 * Claire Gourcuff, claire.gourcuff@euro-argo.eu
 
 
+== Contributors
+
+List of all contributors an their contributions.
+
+*  Schmechtig (@catsch), CNRS
+   PR-1: Details on Argo's Nitrate test
+
+[bibliography]
 == References
 
-(just a starting point. Move it to bibtex)
+* [[BGC_nitrate]] Johnson Kenneth, Maurer Tanya, Plant Joshua, Bittig Henry, Schallenberg Christina, Schmechtig Catherine (2021). BGC-Argo quality control manual for nitrate concentration. https://doi.org/10.13155/84370

src/realtime_qc.bib

@@ -0,0 +1,8 @@
+
+@manual{johnson2021bgc,
+  title={BGC-Argo quality control manual for nitrate concentration},
+  author={Johnson, Kenneth and Maurer, Tanya and Plant, Joshua and Bittig, Henry and Schallenberg, Christina and Schmechtig, Catherine},
+  year={2021},
+  edition={Version 1.0},
+  doi={10.13155/84370}
+}

src/tests.adoc

@@ -0,0 +1,33 @@
+= Tests
+
+== Global Range
+
+== Gradient
+
+[stem]
+++++
+X_i = \left| V_i - \frac{V_{i+1} + V_{i-1}}{2} \right|
+++++
+
+== Spike
+
+[stem]
+++++
+X_i = \left| V_i - \frac{V_{i+1} + V_{i-1}}{2} \right| - \left| \frac{V_{i+1} - V_{i-1}}{2} \right|
+++++
+
+== Digit Rollover
+
+[stem]
+++++
+X_i = V_i - V_{i-1}
+++++
+
+== Spike - Median
+
+Proposed at <<BGC_nitrate>>
+
+[stem]
+++++
+X_i = \left| V_i - median(V_{i-2}, V_{i-1}, V_i, V_{i+1}, V_{i+2}) \right|
+++++