[timemanager][...] Rename episode*Over() to episode*Finished()

dumux/common/timemanager.hh

dumux/porousmediumflow/2p2c/sequential/fvpressure.hh

...orousmediumflow/2p2c/sequential/fvpressuremultiphysics.hh

dumux/porousmediumflow/sequential/impetproblem.hh

dumux/porousmediumflow/sequential/onemodelproblem.hh

test/common/generalproblem/generallensproblem.hh

test/multidomain/2cnistokes2p2cni/2cnistokes2p2cniproblem.hh

test/multidomain/2cnistokes2p2cni/2p2cnisubproblem.hh

test/multidomain/2cnizeroeq2p2cni/2cnizeroeq2p2cniproblem.hh

test/multidomain/2cnizeroeq2p2cni/2p2cnisubproblem.hh

test/multidomain/2cstokes2p2c/2cstokes2p2cproblem.hh

test/multidomain/2cstokes2p2c/2p2csubproblem.hh

test/multidomain/2czeroeq2p2c/2czeroeq2p2cproblem.hh

test/multidomain/2czeroeq2p2c/2p2csubproblem.hh

test/porousmediumflow/1p/implicit/1pniconductionproblem.hh

test/porousmediumflow/1p/implicit/1pniconvectionproblem.hh

...porousmediumflow/1p2c/implicit/1p2cniconductionproblem.hh

...porousmediumflow/1p2c/implicit/1p2cniconvectionproblem.hh

test/porousmediumflow/2pncmin/implicit/dissolutionproblem.hh

test/porousmediumflow/3p/implicit/3pniconductionproblem.hh