Merged changes from trunk

* r3931: Mastrfu: Merge declaration and definition
* r3930: renamed vinterp to after_vertint
* r3929: renamed legendre.c to after_sptrans.c
* r3928: renamed fouriertrans.c to after_fctrans.c
* r3927: Select: abort if no timestep is seleced
* r3926: Seltime: Merge declaration and definition
* r3925: Seltime: abort if no timestep is seleced
* r3924: specspace: Merge declaration and definition
* r3923: added Afterburner.c
* r3922: added Afterburner.c