cleanups in stralloc and buffer:

int -> long for sizes
    char -> unsigned char for strings

buffer/buffer_init.c

@@ -1,6 +1,7 @@
 #include "buffer.h"
 
-void buffer_init(buffer* b,int (*op)(),int fd,char* y,unsigned int ylen) {
+void buffer_init(buffer* b,int (*op)(),int fd,
+		 unsigned char* y,unsigned long int ylen) {
   b->op=op;
   b->fd=fd;
   b->x=y;