gui: use VectorFc instead of SetFc
gui: use FragmentCollection instead of prev/next
test: do not use/test prev/next
update description of OutputPipe
algo: use FragmentCollection instead of prev/next
remove processor Connector
AlignmentStat: remove property overlapping_fragments
fix long line of Fragment.cpp
Fragment: remove prev and next!
store sequence positions not as size_t, but as pos_t (=int)
lua_lib: add method .split() to string
util_lua.cpp: remove extra namespace closing and opening
util_lua: bind function read_file
AbstractAligner.align_seqs(): remove gap columns
AbstractAligner: add function remove_pure_gap_columns

bind to Lua
add test for remove_pure_gap_columns
model_lua: bind vector<SequencePtr> as Lua table
lua_lib: add processors MakeSubPangenome and SubPangenome
model_lua: fix binding of fragment_pos

it was bind to wrong function
FindGeneGroups: use TO_S