this allows repeated test suite names across apps without conflicts

previously rebar3 dropped suites declared at the root of the project (via
`--suite=whatever_SUITE' probably) and warned. this was because the compiler
would recursively copy and compile everything in the directory indicated by
the test suite. this changes the copy mechanism to only copy erl source files
and directories that end with `_SUITE_data' into the `extras' dir in `_build'

support temporary cdn change with HEX_CDN os var

Fix wrong relative path resolution

A bad template index does not crash; shows warning

Tests both absolutes and relative paths.

Add support for total code coverage

This should fix #955

The test is implicit as a bad index previously silently crashed rebar3.
By adding the bad index to the `new` suite's files, we can show that
things keep running.

symlink mib hrl output in apps `include' directories

upgrade certifi to latest release

this restores compatibility with rebar2 and erlang.mk

fix tupple merging for realsies.

Full rewrite, code should be understandable now.

Tup merge tests

- proper segregation of comparison between tuple terms and non-tuple
  terms. Guards weren't specific enough and that meant the wrong clauses
  of guards would be triggered
- proper deduplication of entries in the list. An additional N passes
  are required (we co-opt the reverse step to be more efficient) because
  while the original lists:umerge easily removes dupes, this is
  requiring more logic here since `[a,{a,b},{a,b,c},a,{a,b,c}]` is a
  possible interleaving and we'd want `[a,{a,b},{a,b,c}]` -- comparison
  of direct neighbours isn't enough.

(the tests fail)

Fix a small bug in the MIB compiler when building dependencies

Default to no eunit formatter if verbose specified

The previous default meant that verbose output would not be emitted.

fetch eunit_formatters config not from the command args but from the config

When compiling a dependency with a MIB file the generated hrl file is left in
the root project directory in a file called "include". This has the perverse
effect of messing up the search path for include files causing any dependencies
with files in their "include" directory to fail to build after that.

auto-update the registry if a pkg isn't found, fail if it still isn't found

remove backward_compat entry from travis s3

special handling of relx configs in profiles

Relx config need new values at the end of the list and
profile additions prepended. So now in apply_profile in
the case it is a relx config we prepend the config list.
This does, however, mean that a profile release can not
'extend' a release defined in the default profile since
the one being extended would have its definition after
the profile release and thus relx would not be able to
use its values for extending.

preserve attributes when copying files in rebar_utils:cp_r for unix

don't add a provider if the same namespace and name already exists

Handle force flags in leading position

The checking of flags and the parsing of arguments is separated up.

Ct output improvements

- eunit assert look better
- lager logs to the html logs

upgrade eunit_formatters to 0.3.1 for OTP18 bug fix