[recycling] bound_pseudo: fix handling of initial norm
[deflation] fix norm
[utils] add Timings and TimedLinearOperator
[recycling] fix non-computable bound
[linsys] add TimedLinearSystem
[tests] prepare recycling tests
[linsys] ip -> ip_B in operations()
[deflation] bound_pseudo: fix nasty numpy.array/list confusion bug
[recycling] use timings in recycling