[Halld-offline] code blocks + syntax highlighting on wiki

[David Lawrence]

Hi All,

   At Paul's suggestion I have downloaded and installed an extension to 
our wiki for syntax highlighting of source code. The documentation can 
be found here:

http://www.mediawiki.org/wiki/Extension:SyntaxHighlight_GeSHi


The short tutorial is: wrap your code block in <syntaxhighlight> 
</syntaxhighlight> tags.

You can also have it add line numbers and/or highlight a specific line 
you want to emphasize.

Multiple languages are supported, but I have set the default to C++ so 
no language needs
to be specified for C++ code.

To see an example of this on our wiki, look here:

https://halldweb1.jlab.org/wiki/index.php/HOWTO_extract_photons_or_pi0%27s_from_the_framework


One additional note: I have created a file README.JLab in the directory 
where the wiki source files
are kept. I have written down details there on what changes were made 
and why regarding this
extension as well as a few others. The intent is for this to help with 
maintaining the wiki and help
remind us what needs to be done when we upgrade again at some point in 
the future. Please help
keep this file up to date if additional extensions are installed as well 
as other modifications.

Regards,
-David