Macros for detected ball radius and lookup grid size should be parameters

[geronm]

In gelsight_groundtruth_gen.cpp (and likely soon in gelsight_depth_driver) there are macros declared for the expected detected ball size:

#define BALL_RADIUS_GUESS 45  // radius of detected ball. TODO: Make this a CL argument
#define BALL_RADIUS_GUESS_MARGIN (BALL_RADIUS_GUESS + 20)  // margin of error on ball radius, for HoughCircle
#define SNAPSHOT_WIDTH (2*BALL_RADIUS_GUESS_MARGIN)`

, and for the grid size of the lookup table:

#define REF_PT_ROWS 4  // grid resolution of final lookup table (how many lookup locations there are) TODO: CL argument
#define REF_PT_COLS 3
#define REF_GET_IMROW(ptrow, imrows) ( ((1+(ptrow)) * (imrows)) / (1+REF_PT_ROWS) )
#define REF_GET_IMCOL(ptcol, imcols) ( ((1+(ptcol)) * (imcols)) / (1+REF_PT_COLS) )

These should be moved into A) command line arguments in groundtruth_gen and B) parameters automatically read from the groundtruth output by depth_driver