also rename wchar -> utf8 to avoid conflict with <wchar.h> (requires
rebuild of workspace)
(unfortunately copying history fails to "502 bad gateway"; had to delete
old + add new independently)
This was SVN commit r7340.
also improved filtering of the frame delta times.
while at it, improved interface of whrt backends to avoid leaking
implementation details.
This was SVN commit r6401.
test_bits: add tests for all routines in bits.h
hpet: add safety check
unit.h, bits.h, DOMEvent.h: change T(~0) to ~T(0) (required when T is
64-bit)
This was SVN commit r6335.
