mew-summary-refile-report: Show warning when mew-header-reasonable-size does not cover the header
of the selected message.
Merge pull request #65 from ushiushix/warn-header-reasonable-size-with-report

mew-summary-refile-report: Show warning when mew-header-reasonable-size does not cover the header of the selected message.
Increase mew-header-reasonable-size to 10000
Merge pull request #66 from tats/bug/header-size

Increase mew-header-reasonable-size to 10000