minor, operate in terms of echs_fund messages

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, make co_appl_adj return a echs_fund_s object, that means ...

the writer coru cannot be chained directly.

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
test, adapt, use precision fiddling to overcome scaling problems

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'core/coru-msgs'

* core/coru-msgs:
  test, adapt, use precision fiddling to overcome scaling problems
  minor, make co_appl_adj return a echs_fund_s object, that means ...
  minor, operate in terms of echs_fund messages