[krbdev.mit.edu #6055] SVN Commit

[Alexandra Ellwood via RT]

Make unset strings in kim_options and kim_selection_hints
be empty strings rather than NULL.  This simplifies the
stream code (and makes it easier to read and debug).
In order to prevent copying tons of NUL bytes around,
special case kim_string functions to use a special 
constant kim_empty_string.

Commit By: lxs



Revision: 20804
Changed Files:
U   trunk/src/include/kim/kim_selection_hints.h
U   trunk/src/kim/lib/kim_library_private.h
U   trunk/src/kim/lib/kim_options.c
U   trunk/src/kim/lib/kim_selection_hints.c
U   trunk/src/kim/lib/kim_string.c
U   trunk/src/kim/lib/kim_string_private.h
U   trunk/src/lib/krb5/os/init_os_ctx.c