* fix#13496 handle tombstones
* add test
* more tests
* fix#13504; add SharedTable tests
* fix #https://github.com/nim-lang/Nim/issues/13505 intsets.missingOrExcl silently gave wrong results sometimes
* add test for tintsets
* use existing sort for CountTable, and
add SortOrder options to CountTable, OrderedTable sort(s)
* add some tests, runnables, etc.
* fix runnable imports
* added `==` for OrderedTable, CountTable and the *Ref types
* added missing documentation to all `==` procs
* fixed clear() for OrderedTables, which did not work because `var`
does not work well with `|`
* added tests
The tests for tables.clear() in tests/collections/ttables.nim currently fail as a result of #4448, so I've wrapped them in a
'when false' to disable them until the bug is fixed.
- In sets, tables, strtabs, critbits, xmltree
- This uses the new var parameter overloading
- mget variants still exist, but are deprecated in favor of `[]`
- Includes tests and fixed tests and usages of mget
- The non-var `[]` now throws an exception instead of returning binary 0
or an empty string
Fixes an error with mpairs iterator which was introduced with 5fbcf93860. This is used by nimforum thats why I found it. I also added a testcase for the mpairs iterator.
