add menu location to help pages

[hamish]

Hi,

it might be a nice idea to add the XML menu location to help pages.

see ​http://grass.osgeo.org/gdp/grassmanuals/grass64_module_list.html

for an example. (built by tools/module_synopsis.sh and 'python menudata.py commands')

If menu position exists, it could be inserted between the auto-gen Usage header part and the description.html part. It could probably use menudata.py without the table produced by module_synopsis.sh (although the concept of saving the output in a text file would likely be faster than rerunning menudata.py for every module)

Hamish

[neteler]

Duplicate of trac #645