Manpages of src:firebird3.0 in Debian experimental

• fb_config(1)
• fb_lock_print(1)
• fbguard(1)
• fbstat(1)
• fbsvcmgr(1)
• fbtracemgr(1)
• firebird(1)
• gbak(1)
• gfix(1)
• gpre(1)
• gsec(1)
• isql-fb(1)
• nbackup(1)