Remove dependencies on IDs

[abojchevski]

Some classes in nalaf depend on directly, instead of as a parameter.

PRO_CLASS_ID = 'e_1'
MUT_CLASS_ID = 'e_2'
ORG_CLASS_ID = 'e_3'
PRO_REL_MUT_CLASS_ID = 'r_4' # e_1/e_2
PRO_REL_ORG_CLASS_ID = 'r_5' # e_1/e_3

• nala depends on nala constants (not nalaf's)
• relna depends on relna constants (not nalaf's)
• Remove those dependencies from nalaf completely (that means no default param values either)
• Remove the constants
• Change it in nala such that you provide now as param the IDs that once were assumed as default
• Change in relna