create a new 'gdal-help' or 'gdal-commands' command

[maphew]

I frequently need to refresh my memory about what gdal utilities are available or how to spell them (now is that gdalwarp or gdal_warp?)

Right now with all gdal utils installed in bin I accomplish this with dir %gdal%\bin\*.exe %gdal%\bin\*.py in a batch file (see below). It's not pretty, but functional. This won't work if the utilities end up somewhere else with a lot of other unrelated tools. However I wouldn't want to force people to add a special directory tree and lengthen the PATH just for gdal if that is not inline with the system's standards. Having a gdal-help command would make this a non issue (and cross platform).

[maphew]

new version:

• reports gdal version
• improved display for better readability

[Jukka Rahkonen]

Implemented for Windows by a man named Matt Wilkie <maphew> as "o-help.bat" that is included in OSGeo4W.