(format_hex_string, format_decimal, write_decimal_length): Take a
lsh_string and position for the destination. Updated to use
functions from lsh_string.c. Moved some functions to lsh_string.c.
(ssh_format): Changed definition of %r, now stores the start
position of the reserved area, not a pointer.
(lsh_string_colonize): Use const for input string. Use
lsh_string_putc.
(lsh_string_bubblebabble): Use lsh_string_putc. No need for
explicit NUL-termination. Use const for input string.

Rev: src/format.c:1.54
Rev: src/format.h:1.43