Combined PGN features

Export of five new BHSA features: pgn_prde, pgn_prps, pgn_prs, pgn_verb, and pgn_verb_prs (i.e. verb+suffix). These BH features combine person, gender and number (pgn_) properties (if existent) of personal pronouns, (prps); demonstrative pronouns (prde); the verb and its suffix (prs), if the verb has one; and the suffix (prs) of a word. The features were only available in the BHSA in a transliterated or full BH form (prps, prde, prs). In addition, a combination of multiple other features is needed to determine the pgn property of pronouns, verbs, and suffixes. For example, to retrieve the PGN of a verb five seperate features are needed: pdp, nu, ps, gn and prs. This release saves feature administration while programming.