Separate format1 and format2 documentation.

The main how-to index is for format2. It refers format1 users to a subdirectory.
The format2 version recommends <depend>, but does not yet mention <devel_depend>
or <exec_depend>.
The format1 version does not mention <depend>.
 remove empty format1 test pages
add rostest configuration page (#437)
add how-to page on downloading test data (#437)
add gtest page (#437)
add python unit test page (#437)
format1 (only) version of the how-to docs
Merge pull request #443 from jack-oquin/format1

Format 1 (only) version of how-to documentation