add notes to TODO
add comment about accounting for some ptrs to SVs not owning a refcnt
use symbolic constants in perform steps
tweak .gitignore
make demo/sizeme_demo.pl work with older perls
Extend SizeMeToken testing
Allow ~ prefix to mean HOME in extract_chunk_from_file RT#87158
reading tied scalar causes shrinkage RT#88192 RT#119295
Bump version to 0.17
Merge branch 'sizeme' of github.com:timbunce/devel-sizeme into sizeme