* C code
    + Removed 'undeclared' SEXP variables from `importGSHHS' (see below) because they had been defined on lines 62:63. (RH 190314)
      - RH fumbling around in C lead to R crashing when importGSHHS() was called.
    + Changed the PROTECT and UNPROTECT calls in `clipperWrapper.cpp' and `convGSHHS.c'. (RH 190313)
      - Disabled 'protectCount' in `clipperWrapper.cpp' because CRAN's rchk cannot determine whether stacks are imbalanced.
      - Added undeclared SEXP variables to function `importGSHHS' in `convGSHHS.c'.
      - Updated copyright date ranges in relevant C files.
  * R code
    + Modified function `refocusWorld' for datasets that don't extend into Antaractica, e.g. borders (RH 190314)
      - Added line 'if (any(is.Ant)) {' before processing polygons with >100 vertices that lie south of -60 degrees latitude.
    + Changed `is.na()' to `all(is.na())' in function addBubbles. (RH 190313)
      - Rdevcheck choked on this example, but this may be only because it is the first example and there is another issue.
    + Modified function `makeGrid' to create hexagons in a pattern consistent with that of rectangles. (RH 190104)
      - If argument `byrow=T', rectangles and hexagons have PIDs that increment by column, otherwise by row.
      - Changed default value of argument `type' from `square' to `rectangle'.