add risk bundle state Burned

v1.8.0-staging-b

amend bundle state 'Burned'

add risk bundle burning

v1.8.0-staging-a

spell correct withdrawal and add burn/burnBundle for riskpool bundles

minor refactoring

v1.7.0-staging-f

minor refactoring

riskpool balance refactoring

v1.7.0-staging-e

riskpool balance refactoring

minor additions and bugfix

1.7.0-staging-k

minor additions and bugfix

IPolicy refactoring

1.7.0-staging-j

IPolicy refactoring

additional renamings

1.7.0-staging-i

rename IPool.expire to release, track open claims/payouts in Policy

changes to allow for policy closing

1.7.0-staging-h

rename IPool.expire to release, track open claims/payouts in Policy

add bundle management to riskpool

1.7.0-staging-g

add bundle management to riskpool

update riskpool balance with premiums

v1.7.0-staging-d

update riskpool balance with premiums