Adding variants iterator and other functions

RcppTskit/.Rbuildignore

@@ -5,6 +5,9 @@
 ^[.]?air[.]toml$
 ^[.]?jarl[.]toml$
 ^\.Rproj\.user$
+^\.idea$
+^src/\.idea$
+^src/tskit/\.idea$
 ^\.\.$
 ^\.clang-format$
 ^\.covrignore$

RcppTskit/NEWS.md

@@ -39,8 +39,31 @@ and releases adhere to [Semantic Versioning](https://semver.org/spec/v2.0.0.html
   to append site rows from \code{R}, mirroring `tsk_site_table_add_row()`.
 - Added `rtsk_mutation_table_add_row()` and
   `TableCollection$mutation_table_add_row()` to append mutation rows from
-  \code{R}, mirroring `tsk_mutation_table_add_row()`.
-- TODO
+  `R`, mirroring `tsk_mutation_table_add_row()`.
+- Added `rtsk_population_table_add_row()` and
+  `TableCollection$population_table_add_row()` to append population rows from
+  `R`, mirroring `tsk_population_table_add_row()`.
+- Added `rtsk_migration_table_add_row()` and
+  `TableCollection$migration_table_add_row()` to append migration rows from
+  `R`, mirroring `tsk_migration_table_add_row()`.
+- Added `rtsk_provenance_table_add_row()` and
+  `TableCollection$provenance_table_add_row()` to append provenance rows from
+  `R`, mirroring `tsk_provenance_table_add_row()`.
+- Added `rtsk_node_table_get_row()` and `TableCollection$node_table_get_row()`
+  to retrieve node-table rows by 0-based row index.
+- Added `rtsk_table_collection_sort()` and `TableCollection$sort()` to sort
+  table collection.
+- Added `rtsk_table_collection_simplify()` and
+  `TableCollection$simplify()` to simplify table collection.
+- Added low-level variant iterators
+  (`rtsk_variant_iterator_init()`/`rtsk_variant_iterator_next()`) and a
+  user-facing `TreeSequence$variants()` method to iterate over decoded
+  site-by-site variants from `R`, aligned with `Python` API
+  semantics for `samples`, `isolated_as_missing`, `alleles`, and
+  `left`/`right` intervals.
+- Added `rtsk_treeseq_get_samples()` and `TreeSequence$samples()` to retrieve
+  sample node IDs from a tree sequence, with `TreeSequence$samples()` now
+  supporting `population` and `time` filters.
 
 ### Changed
 
@@ -53,17 +76,16 @@ and releases adhere to [Semantic Versioning](https://semver.org/spec/v2.0.0.html
   `pointer` to `xptr`.
 - Ensured `TableCollection$tree_sequence()` matches `tskit Python` API:
   it now builds indexes on the `TableCollection`, if indexes are not present.
+- Refined integer validation behaviour across scalar and optional vector inputs.
 - We now use `bit64::integer64` (signed 64 bit integer) instead of `int` aiming
   to approach `tsk_size_t` in `tskit C` (unsigned 64 bit integer); in low-level
   `rtsk_treeseq_get_num_*()` wrappers and count/metadata-length fields.
-- TODO
 
 ### Maintenance
 
 - Turn vignette URL as hyperlinks and similar cosmetics.
 - State that we mirror the `R/Python` APIs and `C++/C` APIs across the package.
 - Update `tskit C` to 1.3.1
-- TODO
 
 ## [0.2.0] - 2026-02-22