Add 'language="xml"', etc. to program listings to enable highlighting

[tgraham-antenna]

The languages supported by the highlighter appears to be:

• bourne
• c
• cmake
• cpp
• csharp
• css
• delphi
• ini
• java
• javascript
• lua
• m2
• perl
• php
• python
• ruby
• sql1999
• sql2003
• sql92
• tcl
• upc
• xml