Signed and Unsigned Chars in Motion

alg.c

• alg_locate_center_size - safe
• alg_draw_location - safe
• alg_noise_tune - must be unsigned
• alg_threshold_tune - safe
• iflood - seems safe
• alg_labeling - seems safe
• dilate9 - safe
• dilate5 - safe
• erode9 - safe
• erode5 - safe
• alg_despeckle - safe
• tune_smartmask - must be unsigned

• Make all images unsigned in all function where possible. Otherwise cast.
• Keep all strings as normal char (signed)
• Split the *filename parameter in event() in two. unsigned char *image and char *filename.