Variable name SIMAVR should be replaced with something else #1
Description
When replacing simreprap/shared/simavr with the current version of simavr, the variable SIMAVR in the top Makefile conflicts with a like-named variable in the simavrs' Makefile.common. Changing the name of the variable with something like SIMAVR_DIR allows to build simreprap with a current version of simavr again.