* Implement cucul_file_read() and cucul_file_write().

prototypes. As they are equivalent, this does not break the ABI.

<cucul.h> will provide the C99 types, even if libcaca has been installed.
  * Rename what's left of "common.h" to "stubs.h".
  * Remove all references to erroneous <inttypes.h> from source files.

* Implement strchr() in kernel.c.
  * Check for snprintf() at configure time.

is going?