New backend daemon code, no SQLite. MCE::Flow.

Squashed commit of the following:

commit 3284b62509
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Aug 10 21:17:06 2014 +0100

    config defaults tidying

commit ade7bcd880
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Aug 10 20:00:01 2014 +0100

    high priority jobs are picked first and inserted to prio queue

commit d450dfd2bd
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Aug 10 19:25:21 2014 +0100

    better status

commit b8a742e5de
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Aug 10 16:54:03 2014 +0100

    update proctitle when worker not running

commit 0c3675a8f4
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Aug 10 16:48:58 2014 +0100

    remove all trace of SQLite - new lightweight Job object

commit a13ed25f6a
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Aug 10 14:45:22 2014 +0100

    rename pollers to tasks

commit 44b50f413f
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Aug 10 14:13:00 2014 +0100

    update docs

commit 517b1ae4c1
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Aug 10 13:55:31 2014 +0100

    merge interactive and poller worker types

commit e9043b90e8
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Aug 10 13:47:41 2014 +0100

    only take one job at a time per worker

commit 2366738d54
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Aug 10 13:43:31 2014 +0100

    auto job priorities

commit 1fd473fd50
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Aug 10 13:18:59 2014 +0100

    preload all worker modules into shared memory

commit 9ceb43c0f7
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Aug 10 13:13:07 2014 +0100

    daemon clean

commit c817a35537
Author: Oliver Gorwits <oliver@cpan.org>
Date:   Sun Aug 10 12:36:24 2014 +0100

    first refactor for MCE::Flow and MCE::Queue

Netdisco/share/environments/deployment.yml

@@ -31,17 +31,17 @@ safe_password_store: true
 # SNMP community string(s)
 # ````````````````````````
 snmp_auth:
-  - tag: 'v2default'
+  - tag: 'default_v2_readonly'
     community: 'public'
     read: true
     write: false
-#  - tag: 'v2default_w'
+#  - tag: 'default_v2_for_write'
 #    community: 'private'
 #    read: false
 #    write: true
 
-# daemon will keep netdisco up to date on this schedule
-# `````````````````````````````````````````````````````
+# this is the schedule for automatically keeping netdisco up-to-date
+# ``````````````````````````````````````````````````````````````````
 #schedule:
 #  discoverall:
 #    when: '5 7 * * *'
@@ -56,16 +56,6 @@ snmp_auth:
 #  expire:
 #    when: '20 23 * * *'
 
-# number of SNMP pollers to run in parallel (in netdisco-daemon)
-# ``````````````````````````````````````````````````````````````
-workers:
-  pollers: 10
-
-# amount parallel DNS resolution for node names
-# `````````````````````````````````````````````
-dns:
-  max_outstanding: 50
-
 # do not discover IP Phones or Wireless Access Points.
 # usually these are visible as device neighbors but don't support
 # SNMP, which just clogs up the job queue.
@@ -74,6 +64,18 @@ discover_no_type:
   - '(?i)phone'
   - '(?i)(?:wap|wireless)'
 
+# number of SNMP workers to run in parallel (in netdisco-daemon).
+# the default is twice the number of CPU cores. increase this if
+# your system has few cores and the schedule is taking too long.
+# ```````````````````````````````````````````````````````````````
+#workers:
+#  tasks: 'AUTO * 2'
+
+# number of parallel DNS queries for node names
+# `````````````````````````````````````````````
+#dns:
+#  max_outstanding: 50
+
 # set to true to globally disable authentication/login.
 # create a user called "guest" if you want to assign port/admin rights.
 # `````````````````````````````````````````````````````````````````````