Add minimum iteration stopping criterion wrapper

[upsj]

Closes #1879

[pratikvn]

Some mising documentation, but otherwise LGTM!

In addition to ensuring minimum iterations when the initial residual is small, it also probably helps in performance when residual (norm) computations dont need to be performed for the first min number of iterations.

[pratikvn]

Some documentation would be needed here, so that users know how to use this wrapper.

[MarcelKoch]

Any idea how this can be realized in the file config? From the user side this:

criteria:
  max_iters: 100
  relative_residual_norm: 1e-6
  min_iters: 10

should be pretty clear, i.e. the first two only activate once min_iters is hit, even though the list of criteria is usually an OR list.

[yhmtsai]

It looks good from the first sight. but feel weird trying explaining it in consistent way

[yhmtsai]

require_iters sounds stronger but it does not fit the class name

[yhmtsai]

LGTM. but need to add the corresponding config setup

[yhmtsai]

Suggested change

	* @param count the number of iterations after which to start checking the
	* inner criterion
	* @param count the number of iterations after which to start checking the
	* inner criterion

nit

[yhmtsai]

Suggested change

	* stopping criterion behaves like the inner criterion.
	* @return a deferred_factory_parameter that can be passed to the
	* stopping criterion behaves like the inner criterion.
	*
	* @return a deferred_factory_parameter that can be passed to the

nit

[yhmtsai]

require_iters sounds stronger but it does not fit the class name

[upsj]

I think the config setup should ideally happen in a subsequent PR, as I'm not that familiar with it, and don't have much time to continue working on this