* legoscia/erl-make-exit-code:
  Make erl -make return non-zero exit code on failure

OTP-13107

Fix mistakes found by 'xmllint'.

This makes it behave like similar Unix tools.

* legoscia/callback-arrow-no-newline:
  Don't add newline after arrow on -callback lines

OTP-13042

In the Emacs Erlang mode, typing "->" will usually automatically add a
newline, which is usually what you want when writing a function, but
not when writing a type spec.  Therefore, there is a check for not
adding the newline when the current line starts with -spec or -type.

This change adds -callback to that check, since it is usually written
the same way as type specs.

If a module includes eunit.hrl, a parse transform adds the function
test/0 on line 0 in the module.  A bug in OTP-18.0 caused
cover:analyse_to_file/1 to fail to insert cover data in the output
file when line 0 existed in the cover data table. The bug is corrected
by the commit "Fix cover output file".

This commit adds a test which checks that the bug is not introduced
again.

This is introduced by ab435488a.

If a module includes lines which are less than 1, for example a module
which includes `eunit.hrl`, its cover output file misses the coverage lines.