ping903q: new option "-a"

* NEWS: Update.
* README: Update.
* configure.ac: Version 0.5.90
* doc/ping903q.1: Update.
* src/ping903q.c: Disallow the use without arguments.
New option -a: query statistics for "all" monitored IPs.

1 files changed, 13 insertions, 0 deletions

diff --git a/README b/README
index 8f8e672..5018eb6 100644
--- a/README
+++ b/README
@@ -70,6 +70,19 @@ You are not required to keep all your IP addresses in a single file.
 If necessary, you can scatter them among several files and name each
 of them in a separate ip-list statement.
 
+IP addresses listed in ip-list files form the "immutable" IP list,
+called so because it cannot be altered while the program is running.
+The REST API allows the user to add any number of IP addresses at
+runtime as well as remove any of IP addresses added this way.  These
+addresses form the "mutable" IP list.  Mutable IP list is preserved
+across program restarts.
+
+This means that actually the immutable IP list is optional.  You may
+choose to keep monitored addresses in an external storage (an SQL
+database, for example) and load them dynamically after the daemon
+has started.  A working example program for adding IP addresses from
+a MySQL database is shipped in the examples directory.
+
 Normally, the ip-list file should contain IP addresses of the hosts to
 monitor.  It is OK, however, to use symbolic DNS names, too.  If a
 hostname resolves to a single A record, such usage is equivalent to