misc: update copyright years

buf: switch to int from bool

misc: added signature for changeset cf6a2b8642c1

misc: added tag 0.2.0 for changeset 7f5b3f035bef

misc: update before 0.2.0 0.2.0

buf: add a test against SIZE_MAX when doubling

misc: update .hgignore

misc: goodbye doxygen

misc: add CHANGES.md

buf_puts: uses memcpy as it may be optimized

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