On the authzperf branch:  Boost config file parsing.

Instead of fiddling with individual bytes, let the parser fetch whole
lines from the buffer and process these.

* subversion/libsvn_subr/config_file.c
  (parse_context_t): Add another temporary for the current line. Not
                     all parse_* functions will need it but some do.
  (parser_get_line): New parser function, similar to skip_to_eoln.
  (parse_value): Superceded by ...
  (parse_value_continuation_lines): ... this one reading whole lines
                                    excluding the first of a value.
  (parse_option,
   parse_section_name): Parse line-by-line instead of char-by-char.
  (svn_config__parse_stream): Initialize the new context element.


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/authzperf@1615419 13f79535-47bb-0310-9956-ffa450edef68