[wp] new tactic for sequence repeat

headers/header_spec.txt

src/plugins/wp/Makefile.in

src/plugins/wp/TacSequence.ml

src/plugins/wp/TacSequence.mli

src/plugins/wp/Tactical.ml

src/plugins/wp/Tactical.mli

...tip/oracle_qualif/unroll.0.session/script/lemma_LEFT.json

...ip/oracle_qualif/unroll.0.session/script/lemma_RIGHT.json

..._tip/oracle_qualif/unroll.0.session/script/lemma_SUM.json

src/plugins/wp/tests/wp_tip/oracle_qualif/unroll.res.oracle

src/plugins/wp/tests/wp_tip/unroll.i