Some of this stuff is cosmetic/convenience.  I made the macros for my 
nto_target structure testable and moved the comments into the structure 
where they're more useful.

A few things had to do with initializers.  Some of the signal handling 
stuff didn't work because other _init functions hadn't been called so I 
moved them out to where they could be called when the osabi is initialized.

I added osabi and core sniffers.  Some is practical, some is 
future-proofing.  If we start supporting multiple targets, I'm going to 
want to be able to swap our various target processors support in and 
out.  The is_nto_target type stuff can be made more interesting later to 
do things like check to see if the remote host processor matches the 
binary abi and such.

cheers,

Kris

ChangeLog entry:
* nto-tdep.h: Include osabi.h.  Prototypes for generic Neutrino
osabi sniffer, signal handling initializer and
'in_dynsym_resolve_code' function.
(struct nto_target_ops): Put comments inline with struct.  Add osabi
sniffer hook.  Redefine macros to permit testing/assignment.
* nto-tdep.c (nto_find_and_open_solib): Allocate all buffers
dynamically to support arbitrary root paths.  Check for basename of
lib in search path and then check for absolute.
(nto_in_dynsym_resolve_code): New function.
(nto_core_sniffer): New function.
(regset_core_fns): Register core sniffer.
(nto_initialize_signals): New function.
(_initialize_nto_tdep): Move signal initialization code to above to
avoid initialization race conditions.
* nto-procfs.c: Minor formatting/indenting changes.
(procfs_is_nto_target): New function.
(procfs_open): Set nto_is_nto_target.
(_initialize_procfs): Ditto.  Remove notice_signals() call to avoid
initialization race conditions.
(procfs_create_inferior): Resume inferior after creation.
* i386-nto-tdep.c (init_i386nto_ops): Use new macros for assignment.
(i386nto_init_abi): Initialize signals.  Set
TARGET_SO_IN_DYNSYM_RESOLVE_CODE.
(_initialize_i386nto_tdep): Register osabi sniffer.