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

include app.src.script in app discover

fix plugin provider source name

Fix duplicate function clause in rebar_prv_install_deps:parse_dep/5

fix upgrade of newly added pkg dep from scm locked dep

Validate otp version

support atom for branch names like rebar2

In the spirit of Original Rebar's "require_min_otp_vsn", this adds
rebar_utils:check_min_otp_version/1 (taking a string containing the
minimum version) and rebar_utils:check_blacklisted_otp_versions/1
(taking a list of regular expression strings), as well as tests in
rebar_utils_SUITE. They're currently only called by the tests-
how/where to best place calls to them from non-test code needs to be
determined (at which point two corresponding rebar.config keys can be
supported). For example, the version probably shouldn't be enforced when
just running "rebar3 help".

Fix plugin upgrade when plugin mentioned only by its name

Tidy up "Linking.." messages during compile

Linking message will only be printed the first time the link or copy
actually happens.

Note:

rebar_file_utils:symlink_or_copy will now return 'exists'
instead of ok, if it did nothing because the link exists.

Nothing was checking the return value yet, so seemed reasonable.

run edoc provider in docs provider

Bumped relx to 3.4.0 and erlware_commons to 0.15.0