doc, chore, put succinct red-tape section, licence and dependencies, et al.

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, check for strtod32()

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
hygiene, replace dfp754 guard by HAVE_STRTOD32 guard in rd-d32.c

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, provide proper rounding upon strtod32() if digits exceed significand capacity

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'feat/rn-upon-rd'

* feat/rn-upon-rd:
  minor, provide proper rounding upon strtod32() if digits exceed significand capacity
  hygiene, replace dfp754 guard by HAVE_STRTOD32 guard in rd-d32.c
  chore, check for strtod32()