test, provide regressions for m28 string parsing

Signed-off-by: Sebastian Freundt <hroptatyr@fresse.org>
fix, PEBKAC, for long fractions in m30_get_s() build up the m30 from left to right after the decimal point

Signed-off-by: Sebastian Freundt <hroptatyr@fresse.org>
minor, implement rounding for 8 decimal-point m30s from a string

Signed-off-by: Sebastian Freundt <hroptatyr@fresse.org>
test, provide more regressions for the expo 1 case and ffff_m30_get_s()

Signed-off-by: Sebastian Freundt <hroptatyr@fresse.org>
minor, rewrite __30_1_get_s() case of ffff_m30_get_s() to cope with rounding and excess decimal points

Signed-off-by: Sebastian Freundt <hroptatyr@fresse.org>
test, adapt mux.6.ut test to match current rounding behaviour

Signed-off-by: Sebastian Freundt <hroptatyr@fresse.org>
Merge branch 'core/m30' into next

* core/m30:
  test, adapt mux.6.ut test to match current rounding behaviour
  minor, rewrite __30_1_get_s() case of ffff_m30_get_s() to cope with rounding and excess decimal points
  test, provide more regressions for the expo 1 case and ffff_m30_get_s()
  minor, implement rounding for 8 decimal-point m30s from a string
  fix, PEBKAC, for long fractions in m30_get_s() build up the m30 from left to right after the decimal point
  test, provide regressions for m28 string parsing