This patch enables two features:
* in rebar.config, {diazlyer, [{plt_apps, all_apps}]} makes rebar3 to
add all project files into PLT for subsequent analysis
* rebar3 ct --app=myapp allows single application success typing
This allows workflow suitable for large codebases:
* "rebar3 ct dialyzer --succ-typings=false" to build PLT with all apps
* "rebar3 ct dialyzer --app=myapp" to perform success typing of myapp
Maxim Fedorov