Added a few extra helper funtions

Revised job API descriptions per feedback.

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.

Implemented slurm_send_controller_buffer

NOTE:  primary and secondary controller addresses are currently #defined
this needs to be read from a config file.  SLURM_PORT is also #define to 7000

inclusion of autoconf socket #ifdefs

renamed set_slurm_addr_hton to slurm_set_addr_uint

adjusted arithmetic for packing wrapper routines

   slurmctld.h and api/slurm.h respectively.

   most of the stuff in these files did not belong in common, it has been
   moved elsewhere.

   these are the slurmctld-specific portions of what used to be
   src/common/bits_bytes.h

   what used to be src/common/bits_bytes.c

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