Regularization TV additions

[RainerHeintzmann]

This is a slightly revised way to handle CUDA and TV. However, note that the following two lines of test have been removed: @test TV_cuda(num_dims=2)(x) ≈ reg(x) @test TV_cuda(num_dims=3)(x) ≈ reg(x)

Is this acceptable?

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Codecov Report

Attention: Patch coverage is 43.18182% with 25 lines in your changes missing coverage. Please review.

Project coverage is 85.78%. Comparing base (57ae209) to head (361cd68).

Files with missing lines	Patch %	Lines
src/regularizer_cuda.jl	22.22%	21 Missing :warning:
src/regularizer.jl	76.47%	4 Missing :warning:

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HEAD has 1 upload less than BASE

Flag	BASE (57ae209)	HEAD (361cd68)
	2	1

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
- Coverage   91.39%   85.78%   -5.62%     
==========================================
  Files          13       13              
  Lines         616      647      +31     
==========================================
- Hits          563      555       -8     
- Misses         53       92      +39     

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