bump, release candiate 1 of v0.3.0
fix, PEBKAC, allow am--refresh to proceed without version.mk
minor, check if dfp754 literals are supported
chore, avoid df literals in flavour tests
chore, use exit codes 97/98 (to avoid interference with compiler errors) for dfp flavour tests
chore, die early with no dfp754 support
Merge branch 'bld/chn'

* bld/chn:
  chore, die early with no dfp754 support
  chore, use exit codes 97/98 (to avoid interference with compiler errors) for dfp flavour tests
  chore, avoid df literals in flavour tests
  minor, check if dfp754 literals are supported