Change `tol_galerkin` to `tol` #194

Job	Run time
Julia 1.6 - ubuntu-latest - x64	15m 16s
Julia 1.6 - macOS-latest - x64	14m 15s
Julia 1.6 - windows-latest - x64	20m 31s
Julia 1 - ubuntu-latest - x64	8m 51s
Julia 1 - macOS-latest - x64	9m 29s
Julia 1 - windows-latest - x64	11m 58s
Julia nightly - ${{ matrix.os }} - ${{ matrix.arch }}	0s
	1h 20m 20s

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