Add alloc_size(): every allocator has to be able to answer this, since
-rw-r--r-- 130 .bzrignore
-rw-r--r-- 905 Makefile
-rw-r--r-- 227 README
drwxr-xr-x - ccan
-rw-r--r-- 245 config.h
drwxr-xr-x - hash
drwxr-xr-x - tap
drwxr-xr-x - tools