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