The user provided profiles are mapped on the gapless target sequences
by exact sequence match. The mapping works with an all or nothing principle.
Either all target sequences must be covered by a profile or none. An error
is thrown otherwise.
To avoid ambiguities, the sequences of all provided profiles must be unique
=> in case of a homo-oligomer, one profile must be provided.
If an additional profile is provided that does not match any target sequence,
an error is thrown.