Add LaTeX rendering config for OpenModelica (#77)

For OpenModelica we need:
```
annotation(Documentation(__OpenModelica_infoHeader = "<script type=\"text/javascript\" src=\"https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.7/MathJax.js?config=TeX-AMS_CHTML\"></script>"));
```
Mind MathJax 3 is not supported.

Author: dietmarw

OpenHPL/Waterway/Gate.mo

@@ -74,7 +74,8 @@ Equation numbers and figure numbers given below are in sync with the numbers of
 <p>
 The free flow can be calculated with:
 
-$$Q_A = \\mu_A \\cdot A \\cdot \\sqrt{2g\\cdot h_0} \\tag{8.24} $$
+$$ Q_A = \\mu_A \\cdot A \\cdot \\sqrt{2g\\cdot h_0} \\tag{8.24} $$
+
 (valid for gate opening higher than the downstream water level)
 </p>
 <p>
@@ -86,17 +87,17 @@ With
 <dt> $$ \\mu_A = \\frac{\\psi}{\\sqrt{1+\\frac{\\psi\\cdot a}{h_0}}} \\tag{8.23}$$ </dt>
 <dd>Contraction coefficient sluice gate (\\(\\alpha=90^\\circ\\))</dd>
 <dt> $$ \\psi_{90^\\circ}= \\frac{1}{1+0.64\\cdot \\sqrt{1-(a/h_0)^2}} \\tag{8.25}$$ </dt>
-<dd>Contraction coefficient radial gate (for \\(a/h_0 \\rightarrow 0\\))</dd>
+<dd>Contraction coefficient radial gate (for \(a/h_0 \\rightarrow 0\))</dd>
 <dt> $$ \\psi_0(\\alpha)= 1.3 -0.8\\cdot\\sqrt{1-\\left(\\frac{\\alpha -205^\\circ}{220^\\circ}\\right)^2} \\tag{8.25a}$$ </dt>
-<dd> The edge angle \\(\\alpha\\) of the gate </dd>
+<dd> The edge angle \(\\alpha\) of the gate </dd>
 <dt> $$ \\alpha = \\left( \\frac{\\pi}{2} - \\arcsin(\\frac{h_h-a}{r})\\right) \\cdot \\frac{180^\\circ}{\\pi} $$ </dt>
 </dl>
 <blockquote>
 With:
 <ul>
-<li> \\(a \\ldots\\) Vertical gate opening </li>
-<li> \\(h_h \\ldots\\) Height of the hinge above gate bottom\"</li>
-<li> \\(r \\ldots\\) Radius of the gate arm </li>
+<li> \(a \\ldots\) Vertical gate opening </li>
+<li> \(h_h \\ldots\) Height of the hinge above gate bottom</li>
+<li> \(r \\ldots\) Radius of the gate arm </li>
 </ul>
 </blockquote>
 
@@ -148,11 +149,12 @@ With
 
 <h5>Boundary between free and backed-up flow</h5>
 <p>
-The boundary of the height of the water level \\(h_2\\) behind the gate from which on the calculation switches to the backed-up flow (8.29) can be derived from:
+The boundary of the height of the water level \(h_2\) behind the gate from which on the calculation switches to the backed-up flow (8.29) can be derived from:
 
 $$ \\frac{h_2^*}{a} = \\frac{\\psi}{2} \\cdot \\left( \\sqrt{ 1 + \\frac{16}{\\psi\\cdot\\left(1+\\frac{\\psi\\cdot a}{h_0}\\right)}\\cdot\\frac{h_0}{a}} - 1 \\right) \\tag{8.26}$$
 
-So when \\(\\frac{h_2}{a} \\geq \\frac{h_2^*}{a}\\) then we have back-up flow.
+So when \(\\frac{h_2}{a} \\geq \\frac{h_2^*}{a}\) then we have back-up flow.
 </p>
-</html>"));
-end Gate;
+</html>",
+    __OpenModelica_infoHeader = "<script type=\"text/javascript\" src=\"https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.7/MathJax.js?config=TeX-AMS_CHTML\"></script>"));
+end Gate;

OpenHPL/Waterway/Gate_HR.mo

@@ -88,5 +88,6 @@ $$Q = C_{dx} A \\sqrt{2gH} \\tag{3}$$
 <strong>Note:</strong>
 The use of <code>Cdx</code> is different to the implementaion as done in HEC-RAS. This was done in order to have a smoother transition from the partially to fully submerged region.
 </p>
-</html>"));
+</html>",
+ __OpenModelica_infoHeader = "<script type=\"text/javascript\" src=\"https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.7/MathJax.js?config=TeX-AMS_CHTML\"></script>"));
 end Gate_HR;