Replace unprocessed ~n linebreaks

Fixes #1392

Upgrade relx, erlware_commons and cf

relx ~> 3.22.0
erlware_commons ~> 0.22.0
cf ~> 0.2.2

Add 'recursive' option

Unify different styles of missing_package error

use default region for s3 deployment

Always read REBAR_CONFIG env var when loading config

upload rebar3 escript for every merge to master to rebar3-nightly

The option {recursive,boolean()} can now be set pr directory in
'src_dirs' and 'extra_src_dirs', and on top level in the new
'erlc_compiler' option. Example config:

{erlc_compiler,[{recursive,false}]}.
{src_dirs,[{"src",[{recursive,true}]}]}.

This will cause recursive compilation within the "src" directory, but
not in any other directoires.

Allow rebar3 to edoc itself

Fix rebar3 dialyzer warnings

Some tricky changes in there but should be okay

Add exclude_apps/mods, plt_extra_mods, base_plt_mods config

Fix usage decription of 'rebar3'

* exclude_apps - never use applications for PLT/analysis
* base_plt_mods - add modules to base PLT (overrules exclude_apps)
* plt_extra_mods - add modules to PLT (overrules exclude_apps)
* exclude_mods - never use modules for PLT/analysis (overrules all)

experimental: allow test specifications to be passed via the command line

`rebar3 ct --spec foo.spec,bar.spec,baz.spec` now works

also added support for the `join_specs` flag on the command line

Prevent crashes in `rebar3 as` with no tasks

checks on hd(...) and so on could not handle empty lists

upgrade relx to 3.21.1

Properly support package aliasing and alt names

Fix sys.config's handling in common_test and otherwise.

closes #1289

Fix stacktrace printing in DEBUG=1 mode. Fixes #1347.

It turns out that pretty-printing uses throw-catch and thus garbages out
the stack trace sometimes, so we should get it only once.

- restore path after loading applications,
- helpful comments.

Update Travis CI to latest OTP19.1

This adds tracking of package hash in the in-memory index rather than
the current `undefined' values.

According to the test added, this is not necessary for transitive
package dep hash chcking, but does result in a more complete index search
result when doing app lookups, and could yield some optimizations on
hash checks by checking from the index structure before fetching a package.

Fix private includes when compiling in test profile

Helps cover extra cases.

When an include file is set in a private path (i.e. src/), the rebar3
compiler would not add them to the {i, Path} params -- only include/ and
the project root were being added.

This meant that when some extra source directories were added to the
compile job, such as test/ when running under the test profile, the
private include paths could not be shared with the test module.

This patch fixes the issues (and adds tests) for such a specific case by
adding all the configured include paths to the {i, Path} erl_opts
arguments, yielding successful compile runs.