symlink ct test dirs rather than copy

add support for `rebar3 eunit --file=...'

support pkg attribute on dep to declare package name different from app name

upgrade relx and bbmustache

fix pkgs provider output for new package index format

don't error on upgrade if user removes top level dep

add error message for dependency that doesn't contain single app dir

override 'deps' now automatically overrides '{deps,default}'

improve error messages for packages by checking its existance before fetch

don't store deps list with duplicate in state

use 'default' for default hex repo path in cache and include in info messages

update erlcinfo on disk if source file removed

do not override user cli supplied outputdir for relx

this patch treats pkg and src deps as equals, so level decides winner

Instead fetching and resolving src deps (which could depend on pkg deps)
and then pkg deps this patch combines the two into a single set of
iterations by level. The only difference between src and pkg deps in this
new install_deps is how their deps list is found -- from the config or
lock file for src deps and from the neighbors of the vertex for pkg.

fix leaking hex_registry table

properly update locks for deps and ignore skip messages for locks

fix leaking ets tables when compilation failed

Modify parse_git_url to be more generic

Ferd add mixed deps tests

fix leaking ets tables caused by digraphs