mysqlbak_check.sh: Truncate file list and show summary

Changed MySQL backup check script to truncate file lists (only show 20 files of the most recent and the oldest backups) and show statistics (file number and summarized
size) at the end of each directory listing.

modified:   mysqlbak_check.sh

 Initial commit

 Changes to be committed:
new file:   fs/backup_check.sh
new file:   fs/backup_check_FreeBSD.sh
new file:   fs/backup_diff.sh
new file:   fs/backup_full.sh
new file:   fs/snapshot-rootfs.sh
new file:   host/check-fs-usage.sh
new file:   host/vmhost-status.sh
new file:   mysql/backup.sh
new file:   mysql/mysqlbak_check.sh
new file:   smf/check_smf_pending_users.sh
new file:   smf/mail_user_profile.sh
new file:   smf/smf_fetch_user_profile.sh