use high precision time calls
getwd moved to libc.a and error return changed
finally works (updated for 4.1c and merged with sun)
fix to allow shell scripts to run in background
update to new fs
signal handling bug fix
only save history if "savehist" is specified
convret to new directory format
save history if exceed cpu time or file size limits in shell
convert to new directory format
fix bug with HIST not being reset correctly
add ``history -h >file'' and ``source -h file'' to implement history save and restore.
save history on "login" command
save history on "exec command
put in history save and restore
save history in ~/.history at logout and restore at login
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