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Resolve "Update fft solvers for heffte 2.2.0"

Closes #14

See merge request !18

Resolve "Change FFTPoissonsolver for intel compilers"

Closes #13

See merge request !17

Add communication tags to fftpoissonsolver

Closes #11

See merge request !16

Resolve "Fix global variable pi GPU issue"

Closes #12

See merge request !15

Merge fork to main solvers repo

See merge request !11

Resolve "Fix a bug in FFTPeriodicPoissonSolver"

Closes #10

See merge request !13

Code convention and spacing

See merge request !12

Resolve "FFTPeriodicPoissonSolver"

Closes #5

See merge request !6

conditionals removed in the for loop, but host device warnings occur for cuda build although not affecting results

Update FFT solver test program
NOTE: Solver segfaults in solve()

Conflicts:
	CMakeLists.txt
	Solver.h
	SolverParams.h
	test/TestSolver1.cpp

CG solver

See merge request !5

Remove unnecessary namespace specifications

Add link to Shewchuk's text
Add some more descriptive comments

No longer offer option to correct residue every few iterations

For some reason with the bunch Buffer pre-allocation we need to unroll the inside for loops to avoid calling host_device function from host_function warnings