custom fields on devices and ports in the web from config (#945)

* custom device field web display and edit

* make display work; relies on T::T calling dict slot or method with same syntax

* add storing port custom fields

* use resultset method instead, use cf_ prefix

* update Pg min ver for jsonb

* allow override of position and default for port custom fields

* support hidden for custom fields

* update description of Objects API class

* allow left and mid position for custom fields

* add custom fields in csv

* change port control sidebar label

* fix default missing bug on backend jobs

share/views/ajax/device/ports_csv.tt

@@ -40,7 +40,7 @@
     [% TRY %]
     [% PROCESS "plugin/${config.name}/device_port_column_csv.tt" %]
     [% CATCH %]
-    [% myport.push('') %]
+    [% myport.push( row.get_column(config.field) ) %]
     [% END %]
   [% END %]
 
@@ -53,7 +53,7 @@
     [% TRY %]
     [% PROCESS "plugin/${config.name}/device_port_column_csv.tt" %]
     [% CATCH %]
-    [% myport.push('') %]
+    [% myport.push( row.get_column(config.field) ) %]
     [% END %]
   [% END %]
 
@@ -178,7 +178,7 @@
     [% TRY %]
     [% PROCESS "plugin/${config.name}/device_port_column_csv.tt" %]
     [% CATCH %]
-    [% myport.push('') %]
+    [% myport.push( row.get_column(config.field) ) %]
     [% END %]
   [% END %]