functional tests for operations on a contexts group

context group attach
contexts group attach negative
contexts group detach
contexts group detach after next block
get block num for detached contexts
save block num for a group of detached contexts
are contexts attached
group of context and irreversibl block for forking apps
group of context next block after attach
group of context next block after attach2
group of context next block non forking app
group contexts appnext block new block event event
group contexts appnext irreversible event
group contexts squash massive sync event
group contexts series of  massive sync event
authorization: app_next_block
authorization: context_attach
authorization: context_detach array
authorization: save/get block num