Modal vector test01

[prayush]

Proposed changes

Types of changes:

• Bugfix
• New feature

Component:

• Code
• Documentation
• Build system
• Continuous integration

Code review checklist

• Follows code review guidelines
• Code has documentation and unit tests
• Private member variables have a trailing underscore
• Do not use Hungarian notation, e.g. double* pd_blah is bad
• Header order:
  1. hpp corresponding to cpp (only in cpp files) or tests/Unit/TestingFramework.hpp (only in tests)
  2. Blank line (only in cpp files and tests)
  3. STL and externals (in alphabetical order)
  4. Blank line
  5. SpECTRE includes (in alphabetical order)
• File lists in CMake are alphabetical
• Correct noexcept specification for functions (if unsure, mark noexcept)
• Mark objects const whenever possible
• Almost always auto, except with expression templates, i.e. DataVector
• All commits for performance changes provide quantitative evidence and the tests used to obtain said evidence.
• Make sure error messages are helpful, e.g. "The number of grid points in the matrix 'F' is not the same as the number of grid points in the determinant."
• Prefix commits addressing PR requests with fixup. These commits are flagged
  by Travis so we do not accidentally merge them.
• Include what you use, prefer forward declarations in hpp files.
• Explicitly make numbers floating point, e.g. 2. or 2.0 over 2
• Use Tensor's non-member get if the indices are constant expressions, e.g.
  get<1>(tensor)

Further comments

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (develop@e966cc7). Click here to learn what that means.
The diff coverage is 99.36%.

@@            Coverage Diff            @@
##             develop      #3   +/-   ##
=========================================
  Coverage           ?   98.8%           
=========================================
  Files              ?     316           
  Lines              ?   11351           
  Branches           ?       0           
=========================================
  Hits               ?   11215           
  Misses             ?     136           
  Partials           ?       0

Impacted Files	Coverage Δ
...ericalAlgorithms/Spectral/LegendreGaussLobatto.cpp	86.66% <ø> (ø)
src/Evolution/Systems/ScalarWave/Equations.hpp	50% <ø> (ø)
src/DataStructures/DataBox/DataBoxTag.hpp	100% <ø> (ø)
src/Time/Actions/FinalTime.hpp	100% <ø> (ø)
...lution/Executables/ScalarWave/EvolveScalarWave.hpp	100% <ø> (ø)
...Evolution/DiscontinuousGalerkin/DgElementArray.hpp	96% <ø> (ø)
src/Time/Actions/UpdateU.hpp	100% <ø> (ø)
src/Domain/DomainCreators/RotatedRectangles.hpp	100% <ø> (ø)
...n/Actions/ComputeNonconservativeBoundaryFluxes.hpp	100% <ø> (ø)
src/Parallel/Printf.hpp	100% <ø> (ø)
... and 76 more

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