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

No longer offer option to correct residue every few iterations

Comment operator setter

Resolve "Adapt output types for bitwise operations"

Closes #9

See merge request !10

Use bitwise check in test program

Resolve "Move parameter initialization to member function"

Closes #8

See merge request !9

Resolve "Redesign solver class"

Closes #6

See merge request !7

Use references over pointers

Gradient back to being a pointer type
Add additional template parameters for fields
Also update copyright

Add base class for electrostatics problems

Resolve "Add support for arbitrary operators"

Closes #3

See merge request !4

Solver operator now returns a type different from its argument
Use a wrapper to set the operator

Resolve "Add Poisson solver base class"

Closes #2

See merge request !2