DAO experiment getters

[petrmiko]

There are multiple getters for experiments from person object and from experimentDao with on first sight unclear or even redundant purpose.

For example, in Person object, there is a method getExperiments which returns only some experiments - but not experiments which user owns, such experiments must be obtained by using method getExperimentsForOwnerId. Moreover, for experiments, where is user a subject there is method of getExperimentsForSubjectId.

Bottom line - there is unclear when and where use which method in order to obtained desired data. This may not be a problem not only for experiments data type, but other types as well, this is only an example I've been facing recently.