data(laptop): compute display ppi from resolution and size

Add display.ppi (diagonal_px / size_inch) to all 1,951 laptops with a
resolution + size. Deterministic.

Refs #1

Author: Seungpyo1007

data/laptop/acer/2013/acer-chromebook-14/acer-chromebook-14-ammok-691.json

@@ -13,7 +13,8 @@
   "storage_gb": 32,
   "display": {
     "size_inch": 14.0,
-    "resolution": "1366x768"
+    "resolution": "1366x768",
+    "ppi": 112
   },
   "weight_g": 1450.0,
   "os": "Chrome OS",

data/laptop/acer/2013/acer-chromebook-c910-c2st/acer-chromebook-c910-c2st-ammok-291.json

@@ -13,7 +13,8 @@
   "storage_gb": 16,
   "display": {
     "size_inch": 15.6,
-    "resolution": "1366x768"
+    "resolution": "1366x768",
+    "ppi": 100
   },
   "weight_g": 2190.0,
   "os": "Chrome OS",

data/laptop/acer/2013/acer-chromebook-cb5-571-c1dz/acer-chromebook-cb5-571-c1dz-ammok-908.json

@@ -14,7 +14,8 @@
   "display": {
     "size_inch": 15.6,
     "resolution": "1920x1080",
-    "panel": "IPS Panel Full HD"
+    "panel": "IPS Panel Full HD",
+    "ppi": 141
   },
   "weight_g": 2200.0,
   "os": "Chrome OS",

data/laptop/acer/2016/acer-aspire-3/acer-aspire-3-ammok-670.json

@@ -13,7 +13,8 @@
   "storage_gb": 128,
   "display": {
     "size_inch": 15.6,
-    "resolution": "1366x768"
+    "resolution": "1366x768",
+    "ppi": 100
   },
   "weight_g": 2100.0,
   "os": "Linux",

data/laptop/acer/2016/acer-aspire-5/acer-aspire-5-ammok-467.json

@@ -13,7 +13,8 @@
   "storage_gb": 500,
   "display": {
     "size_inch": 15.6,
-    "resolution": "1366x768"
+    "resolution": "1366x768",
+    "ppi": 100
   },
   "weight_g": 2200.0,
   "os": "Windows",

data/laptop/acer/2016/acer-aspire-a315-51/acer-aspire-a315-51-ammok-150.json

@@ -13,7 +13,8 @@
   "storage_gb": 1024,
   "display": {
     "size_inch": 15.6,
-    "resolution": "1366x768"
+    "resolution": "1366x768",
+    "ppi": 100
   },
   "weight_g": 2100.0,
   "os": "Windows",

data/laptop/acer/2016/acer-aspire-a315-51/acer-aspire-a315-51-ammok-177.json

@@ -13,7 +13,8 @@
   "storage_gb": 128,
   "display": {
     "size_inch": 15.6,
-    "resolution": "1366x768"
+    "resolution": "1366x768",
+    "ppi": 100
   },
   "weight_g": 2100.0,
   "os": "Windows",

data/laptop/acer/2016/acer-aspire-a315-51/acer-aspire-a315-51-ammok-237.json

@@ -13,7 +13,8 @@
   "storage_gb": 1024,
   "display": {
     "size_inch": 15.6,
-    "resolution": "1366x768"
+    "resolution": "1366x768",
+    "ppi": 100
   },
   "weight_g": 2100.0,
   "os": "Linux",

data/laptop/acer/2016/acer-aspire-e5-475/acer-aspire-e5-475-ammok-75.json

@@ -13,7 +13,8 @@
   "storage_gb": 1024,
   "display": {
     "size_inch": 14.0,
-    "resolution": "1366x768"
+    "resolution": "1366x768",
+    "ppi": 112
   },
   "weight_g": 2100.0,
   "os": "Windows",

data/laptop/acer/2016/acer-aspire-e5-576g/acer-aspire-e5-576g-ammok-461.json

@@ -14,7 +14,8 @@
   "display": {
     "size_inch": 15.6,
     "resolution": "1920x1080",
-    "panel": "Full HD"
+    "panel": "Full HD",
+    "ppi": 141
   },
   "weight_g": 2230.0,
   "os": "Windows",