avoid some test-time warnings
Current VMS can handle filenames with spaces.

If they are escaped and on an ODS-5 volume, that is. We
then have to clean up all versions of the files created
by a test we weren't running before.
Bump ExtUtils::Manifest version due to commits 97bae9c5 and bf081550
Version 1.61
Normalize VMS case handling in ExtUtils::Manifest.

Both manifind and maniread were not completely matching filesystem
behavior when downcasing filenames.
Version 1.62
Help ExtUtils::Manifest deal with VMS extended filespecs.

For one thing, if we're cleaning up filenames, lets put that code
in the sub called 'clean_up_filename' rather than in manifind.  And
since the language of the MANIFEST is really Unix-format filespecs,
convert to those.  This becomes especially important in handling
extended filespecs because unixification also unescapes escaped
characters.
Version 1.63
add vim swap files to the ignored list for MANIFEST.SKIP.