-minor code cleanup and doxygen/style fixes

git-svn-id: https://gnunet.org/svn/gnunet@31179 140774ce-b5e7-0310-ab8b-a85725594a96
Add hostname to psycstore.conf (required on W32)

git-svn-id: https://gnunet.org/svn/gnunet@31180 140774ce-b5e7-0310-ab8b-a85725594a96
Add hostname and port to psyc.conf (required on W32)

git-svn-id: https://gnunet.org/svn/gnunet@31181 140774ce-b5e7-0310-ab8b-a85725594a96
Save the prefix value on W32, it does not survive unsetting

git-svn-id: https://gnunet.org/svn/gnunet@31182 140774ce-b5e7-0310-ab8b-a85725594a96
Change gnunet-config detection in gns tests

git-svn-id: https://gnunet.org/svn/gnunet@31183 140774ce-b5e7-0310-ab8b-a85725594a96
Skip tests properly

git-svn-id: https://gnunet.org/svn/gnunet@31184 140774ce-b5e7-0310-ab8b-a85725594a96
Dup the envvar before unsetting, everywhere

git-svn-id: https://gnunet.org/svn/gnunet@31185 140774ce-b5e7-0310-ab8b-a85725594a96