Merge pull request #1 from ikazuhiro/work

Treat a schedule with empty X-SC-Cond: and X-SC-Day: headers as daily one.
adjust indent
remove invisible dummy message number at beginning-of-line

Mew 6.x does not need message number at beginning-of-line.
It seems to be even harmful.
Introduce ``X-SC-Recurrence-Tag:''
Convert encoding to UTF-8
Remove trailing whitespaces
Expand tab to 8 spaces
Default coding-system to UTF-8
Add mhc-goto-next/previous-year
Add mhc-import-from-region
Add .gitignore
Fix format not a string literal
Use fileutils rather than ftools for Ruby 1.9
Use RbConfig rather than Config for Ruby 1.9
Use RUBY_VERSION rather than VERSION for Ruby 1.9
Add magic comment for Ruby 1.9
Use macros for Ruby 1.9
Set rubylibdir to MHC_LIBDIR for Ruby 1.9

For Ruby 1.9.3, the sub directory "1.9" should be "1.9.1" which is
the library compatibility version.
Workaround with force_encoding for Ruby 1.9
Merge pull request #2 from tats/bug/format-string

Fix format not a string literal