Update manpages and auto-completion

doc/man/restic-backup.1

@@ -76,6 +76,10 @@ given as the arguments.
 \fB\-\-time\fP=""
     time of the backup (ex. '2012\-11\-01 22:08:41') (default: now)
 
+.PP
+\fB\-\-with\-atime\fP[=false]
+    store the atime for all files and directories
+
 
 .SH OPTIONS INHERITED FROM PARENT COMMANDS
 .PP
@@ -86,6 +90,10 @@ given as the arguments.
 \fB\-\-cache\-dir\fP=""
     set the cache directory
 
+.PP
+\fB\-\-cleanup\-cache\fP[=false]
+    auto remove old cache directories
+
 .PP
 \fB\-\-json\fP[=false]
     set output mode to JSON for commands that support it