Added signal call to restore sigpipe after send call

Fixed some code for zero size memory allocates, and zero size messages.

from overwritting previously receieved information

I am implementing the new comm layer in all the api functions
added sockopt parameter SO_REUSEADDR to eliminate socket turn around time during debug.

slurm_protocol_errno.h provides a default place for slurm specific error definitions until Jim completes his general errno implementation

Cleaned up comm layer , this never ends :)
added pack and unpack routines for new communcations paradigm

FD_ISSET now returns an int

lots of cleanup

Added a few extra helper funtions

Added support for looping on datagram receives until all the data that is expect on the encapsulated stream has arrived.
This should have been in the original implementation.

inclusion of autoconf socket #ifdefs

added pad to slurm_addr type char pad[16 - sizeof ( int16_t ) - sizeof (uint16_t) - sizeof (uint32_t) ] ;
explictly defined IPPROTO_XXX in socket() call

changed sizeof ( slurm_address ) to sizeof ( slurm_addr ) the size of the data type, not the size of the pointer pointing to the datatype

how about using log4c

fixed added set_slurm_addres_hton to slurm_protocol_util.c

slurm_protocol_api.c			contains the programers interface.
slurm_protocol_interface.h 		defines the lower layer interface.
slurm_protocol_pack.c			packs messages.
slurm_protocol_util.c			contains utility functions used by the protocol