Updates to 3rd party libraries

Add Dockerfile and specific docker-php.ini

inc/vendor/phpoffice/phpspreadsheet/docs/topics/accessing-cells.md

@@ -426,9 +426,9 @@ for ($row = 1; $row <= $highestRow; ++$row) {
 echo '</table>' . PHP_EOL;
 ```
 
-Note that we can't use a &lt;= comparison here, because 'AA' would match
-as &lt;= 'B', so we increment the highest column letter and then loop
-while \$col != the incremented highest column.
+Note that we can't use a `<=` comparison here, because `'AA'` would match
+as `<= 'B'`, so we increment the highest column letter and then loop
+while `$col !=` the incremented highest column.
 
 ## Using value binders to facilitate data entry
 

inc/vendor/phpoffice/phpspreadsheet/docs/topics/autofilters.md

@@ -285,8 +285,8 @@ $columnFilter->createRule()
 
 We also set the rule type to CUSTOMFILTER.
 
-This defined two rules, filtering numbers that are >= -20 OR <=
-20, so we also need to modify the join condition to reflect AND rather
+This defined two rules, filtering numbers that are `>= -20` OR `<=
+20`, so we also need to modify the join condition to reflect AND rather
 than OR.
 
 ``` php

inc/vendor/phpoffice/phpspreadsheet/docs/topics/reading-and-writing-to-file.md

@@ -634,16 +634,16 @@ $writer->setSheetIndex(0);
 #### Setting the images root of the HTML file
 
 There might be situations where you want to explicitly set the included
-images root. For example, one might want to see
+images root. For example, instead of:
+
+ ``` html
+ <img src="./images/logo.jpg">
+ ```
+
+You might want to see:
 
 ``` html
-<img style="position: relative; left: 0px; top: 0px; width: 140px; height: 78px;" src="http://www.domain.com/*images/logo.jpg" border="0">
-```
-
-instead of
-
-``` html
-<img style="position: relative; left: 0px; top: 0px; width: 140px; height: 78px;" src="./images/logo.jpg" border="0">.
+<img src="http://www.domain.com/images/logo.jpg">
 ```
 
 You can use the following code to achieve this result:

inc/vendor/phpoffice/phpspreadsheet/docs/topics/recipes.md

@@ -3,12 +3,12 @@
 The following pages offer you some widely-used PhpSpreadsheet recipes.
 Please note that these do NOT offer complete documentation on specific
 PhpSpreadsheet API functions, but just a bump to get you started. If you
-need specific API functions, please refer to the API documentation.
+need specific API functions, please refer to the [API documentation](https://phpoffice.github.io/PhpSpreadsheet/master).
 
 For example, [setting a worksheet's page orientation and size
 ](#setting-a-worksheets-page-orientation-and-size) covers setting a page
 orientation to A4. Other paper formats, like US Letter, are not covered
-in this document, but in the PhpSpreadsheet API documentation.
+in this document, but in the PhpSpreadsheet [API documentation](https://phpoffice.github.io/PhpSpreadsheet/master).
 
 ## Setting a spreadsheet's metadata
 
@@ -132,7 +132,7 @@ will take care of displaying the formula according the applications
 language. Translation is taken care of by the application!
 
 The following line of code writes the formula
-`=IF(C4>500,"profit","loss")` into the cell B8. Note that the
+`=IF(C4>500,"profit","loss")` into the cell B8. Note that the
 formula must start with `=` to make PhpSpreadsheet recognise this as a
 formula.
 
@@ -301,7 +301,7 @@ $spreadsheet->getActiveSheet()->getPageSetup()
 ```
 
 Note that there are additional page settings available. Please refer to
-the API documentation for all possible options.
+the [API documentation](https://phpoffice.github.io/PhpSpreadsheet/master) for all possible options.
 
 ### Page Setup: Scaling options
 

inc/vendor/phpoffice/phpspreadsheet/docs/topics/worksheets.md

@@ -31,8 +31,6 @@ index, use the `getSheet()` method.
 $spreadsheet->getSheet(1);
 ```
 
-If you don't specify a sheet index, then the first worksheet will be
-returned.
 
 Methods also exist allowing you to reorder the worksheets in the
 workbook.
@@ -71,7 +69,7 @@ $spreadsheet->createSheet();
 ```
 
 A new worksheet created using this method will be called
-"Worksheet<n>" where "<n>" is the lowest number possible to
+`Worksheet<n>` where `<n>` is the lowest number possible to
 guarantee that the title is unique.
 
 Alternatively, you can instantiate a new worksheet (setting the title to