[#152] HP devices with port names "D##" not sorted by portsort.js

In naturalsort there is handling for Float, Decimal and Scientific notation.
This looks for numbers like:
'10.04f','10.039F','10.038d','1.528535047e5'

It was breaking port sorting for ports named like "D1", "D10" etc.

Have removed support for sorting these numbers as it's unlikely we need that
in Netdisco, for now.

Netdisco/t/10-sort_port.t

@@ -13,5 +13,6 @@ BEGIN {
 
 is(sort_port(1,1), 0, 'number - same values');
 is(sort_port('1:2','1:10'), -1, 'colon number (Extreme) - first lesser');
+is(sort_port('D1','D10'), -1, 'HP - simple letter and number [#152]');
 
 done_testing;

Netdisco/t/html/portsort.html

@@ -146,6 +146,18 @@
                     ],[
                         '1:1','1:2','1:10','1:11'
                     ],'Extreme');
+                wrapTest(
+                    [
+                        'D10','D11','D2','D1', 'A30', 'A3'
+                    ],[
+                        'A3', 'A30', 'D1','D2','D10','D11'
+                    ],'HP A & D');
+                wrapTest(
+                    [
+                        'B10','B11','B2','B1', 'A30', 'A3'
+                    ],[
+                        'A3', 'A30', 'B1','B2','B10','B11'
+                    ],'HP A & B');
                 wrapTest(
                     [
                         '10GigabitEthernet1/1/12',