fix leaking ets tables caused by digraphs

Just rework the error message.

On a single app's dep list, the first noted wins if there's a duplicate
between packages and sources, rather than favoring source there anyway.

Requires a rework of other test suites using the same dep-handling
mechanism.

Tree provider

install package deps in same level/profile order as src deps

Dialyzering

Fix some unknown functions/types dialyzer warnings

don't run rebar2 get-deps in travis

fix dialyzer warnings, except 'no local return' warnings

Changes parse_git url function to use Using RFC3986 standard to validate
git uri instead of matching strings in function head. Also accepts scp
style syntax for parsing.

Detect missing EPMD, error, fallback and advise.

add tree option to deps command that prints pkg deps tree

upgrade depends on the lock provider and lock prv sets state

Fix description in "rebar3 new"

`template` is not a kv-style argument, but a plain argument. If you give `template=app` on the command line, you get "template not found."

keep correct Level for pkg deps of scm deps

only use upgrade on default deps

basic 🐟 completions

sort versions of packages in `rebar3 pkgs` output

escape & in paths

fix find of deps for clean all

keep plugins dir as deps dir when compiling plugins+deps