Fix issue 1692: obscure bugs in formatting of time/date strings.
Fix issue 1692: obscure bugs in formatting of time/date strings.

* subversion/libsvn_subr/time.c (svn_time_to_human_cstring): 
  Fix the formatting of negative fractional-hour time offsets: an offset
    of -75 minutes was written as "-01-15" instead of the correct "-0115".
  Ensure that the string is terminated even if the human-readable part
    cannot be written.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion