Log Message:
Update to 6.4:

Version 6.4 05-Sep-05
---------------------

 1. Change 6.0/10/(l) to pcregrep introduced a bug that caused separator lines
    "--" to be printed when multiple files were scanned, even when \ 
none of the
    -A, -B, or -C options were used. This is not compatible with Gnu grep, so I
    consider it to be a bug, and have restored the previous behaviour.

 2. A couple of code tidies to get rid of compiler warnings.

 3. The pcretest program used to cheat by referring to symbols in the library
    whose names begin with _pcre_. These are internal symbols that are not
    really supposed to be visible externally, and in some environments it is
    possible to suppress them. The cheating is now confined to including
    certain files from the library's source, which is a bit cleaner.

 4. Renamed pcre.in as pcre.h.in to go with pcrecpp.h.in; it also makes the
    file's purpose clearer.

 5. Reorganized pcre_ucp_findchar().