print_items can print results in pages, flavorlist
if called with page_size a possitive int, print_items holds every page_sizeresults and waits for user input to continue.
This is used in flavor_list for the moment, but is going to be a std optionfor all *_list commands
Enrich help messages in all server * commands
Enrich helps in server create
Enrich personality argument helps in server create
Generalize connection error help for all server-*
Bugfixes
Handle connection errors, allow special handling
Showcase: server_info catche/manage clienterror that wasa connection error
Merge branch 'develop' into feature-output
Merge branch 'develop' into feature-argument
Move DateArgument to argument from pithos
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