hostlist.[ch] functions.

Set initial value of n in hostset_insert_range to eliminate warning on compile

read and write size members now move in tandem

added more assert checks

Changed version numbers to dates in version field of API man pages.

Added EINTR functionality
Added free_circular_buffer routine

Moe, put that prefix in, but it looks like he got rid of it everywhere else

added EINTR handling to send and recv protocol routines
improved signal management during sends

   manipulating lists of hostnames (optimized for prefixNNN style names)

Changes to error codes in others (some redundant codes removed).

I also moved the message types to enums, and probably some other small things.

-Joey

Minor revisions to info man page.