[ET Trac] #2951: Cottonmouth uses `max()` unqualified without a using declaration

[Maxwell Rizzo]

#2951: Cottonmouth uses `max()` unqualified without a using declaration

 Reporter: Maxwell Rizzo
   Status: new
Milestone: 
  Version: 
     Type: bug
 Priority: major
Component: EinsteinToolkit thorn

CottonmouthZ4c4m/src/CottonmouthZ4c4m_z4c_enforce_pt1.cpp
CottonmouthBSSNOK4m/src/CottonmouthBSSNOK4m_enforce_pt1.cpp

both files have unqualified calls of the `max()` function. Both have the same using statement on line 41,

```
using std::cbrt,std::fmax,std::fmin,std::sqrt;
```

`fmax` being unused in both files maybe suggests that this `std::fmax` should be `std::max`, as it is generated code it isn't clear if this is a human error or an issue with the generation.

Cottonmouth fails to compile on Anvil with error

```
error: 'max' was not declared in this scope
```

--
Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2951/cottonmouth-uses-max-unqualified-without-a
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