Log Message:
Update to 1.13:

1.13
- move non fatal Perl bug checks into the help screen output
- fix Perl warnings when wrong/unknown charset is used
- run check for some essential Encode functionality at every startup
- add --fixdouble option to only fix files that are double-UTF-8 encoded
- add --parsable option to allow convmv output parsable suggestions for external \ 
tools to to something with it
- add --preserve-mtimes option to restore mtimes of parent directories
- allow an argv to be a symlink
- don't checksum deleted files in tar ball and use sha256 now
- allow skippig of certain test suite tests, useful for OS X to skip NFC/NFD \ 
related stuff, for example "make test \ 
SKIPTESTS=nfd-test,someothertest" will skip that test(s)