MQM code: use R_alloc/S_alloc rather than Calloc/R_chk_calloc

 - Trying to fix memory leaks reported by valgrind; simplest solution is
   to just switch to using memory that R controls (and frees on our
   behalf).
Merge branch 'devel' into mqm_memory

[skip ci]
add if(verbose) for Rprintf statement in mqmscan.cpp
Merge branch 'mqm_memory' into devel

(Fix conflict in src/mqmaugment.cpp)