Referencing xml files and graphic files

[Samir Menon]

Consider having a relative directory based naming structure in the xml file.

E.g., In the config file, we presently have:

<file>../../specs/Puma/Puma-AKB86.xml</file>

Could consider changing it to in the default parser:

<file>Puma/Puma-AKB86.xml</file>

Alt, we could do something like:

<file get_basedir_from="basedir_file.xml">../../specs/Pr2/Pr2.xml</file>        

[Samir Menon]

To note, we won't support Cfg.xml file path references because the Cfg file could be anywhere.