Change AUTHORS, CHANGELOG, and README file from HTML to Markdown.
Merge.
Fix typo.
Merge.
New methods for querying memory usage of individual objects and object graphs in Graal API (MetaAccessProvider#getMemorySize, MetaUtil#getMemorySizeRecursive).
mx_graal: fix pylint 1.1.0 warnings

--HG--
extra : histedit_source : 1491b7da59b5b340d01899656b96b643f7b3e267
mxtool: fix pylint 1.1.0 warnings

--HG--
extra : histedit_source : 93ec53d6c8cd3e1d49d312c6748ed0e53c50e317