UserSpace: Add keyfiles.

In an effort to collect all the user- and analysis specific files in one place,
create the userAnalysisWorkspace directory with separate subdirectories for
each channel. As it is the easiest thing to sort in there, move all the
keyfiles to the respective channel's directory.
UserSpace: Move files from generators to UserSpace.

Move all the files which could be matched to a channel to from the generators
subdirectory to the userAnalysisWorkspace. Note that in this commit, the files
are only moved but not updated or checked for functionality.
generators: Remove header for root script.

Remove a header file which was used to compile one of the plotting root
scripts. With the removal of the gui some time ago, these scripts are not
compiled anymore so this files was superfluous.