added posibility to use est_t_max for time adaptivity. The time error may now be defined as est_t_combined =sum_fac*est_t_sum + max_fac*est_t_max. Default is sum_fac=1 and max_fac=0. Thus, by default adaption is working as before. 

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Introduction of multi-mesh method for gradients of basis function. Some code refactoring, removed NEW and DELETE macros.

included new variable <lastProcessedTimestep> in AdaptInfo, in order to have the timestep which lead to current time in user program

interpol between different DOFVectors failed if coords of DOF identical,\n thus rule to decide if point is in element  is relaxed