sam2p -- multiple issues

sam2p developers report: In sam2p 0.49.3, a heap-based buffer overflow exists in the pcxLoadImage24 function of the file inpcx.cpp. In sam2p 0.49.3, the inxpmreader function in inxpm.cpp has an integer signedness error, leading to a crash when writing to an out-of-bounds array element. In sam2p...