## What changes were proposed in this pull request?

Move many top-level files in dev/ or other appropriate directory. In particular, put `make-distribution.sh` in `dev` and update docs accordingly. Remove deprecated `sbt/sbt`.

I was (so far) unable to figure out how to move `tox.ini`. `scalastyle-config.xml` should be movable but edits to the project `.sbt` files didn't work; config file location is updatable for compile but not test scope.

## How was this patch tested?

`./dev/run-tests` to verify RAT and checkstyle work. Jenkins tests for the rest.

Author: Sean Owen <sowen@cloudera.com>

Closes #11522 from srowen/SPARK-13596.

check -license will passed in next time when rat jar download failed.

Add 2 step to fix this:
1. Clean the rat.jar if download failed.
2. Add a check logic after run rat checking.

Author: June.He <jun.hejun@huawei.com>

Closes #5421 from sisihj/rat-issue and squashes the following commits:

4958302 [June.He] delete redundant check and add quoted
66f7088 [June.He] Fix RAT checks still passed issue when download rat jar failed
7311e83 [June.He] Fix RAT checks still passed issue when download rat jar failed

Author: GuoQiang Li <witgo@qq.com>

Closes #4263 from witgo/SPARK-5474 and squashes the following commits:

ef397ff [GuoQiang Li] review commits
a398324 [GuoQiang Li] curl should support URL redirection in build/mvn

When we use `make-distribution.sh` with `--with-tachyon` option, Tachyon will be downloaded by `wget` command but some systems don't have `wget` by default (MacOS X doesn't have).
Other scripts like build/mvn, build/sbt support not only `wget` but also `curl` so `make-distribution.sh` should support `curl` too.

Author: Kousuke Saruta <sarutak@oss.nttdata.co.jp>

Closes #3988 from sarutak/SPARK-5188 and squashes the following commits:

0f546e0 [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-5188
010e884 [Kousuke Saruta] Merge branch 'SPARK-5188' of github.com:sarutak/spark into SPARK-5188
163687e [Kousuke Saruta] Fixed a merge conflict
e24e01b [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-5188
3daf1f1 [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-5188
3caa4cb [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-5188
7cc8255 [Kousuke Saruta] Fix to use \$MVN instead of mvn
a3e908b [Kousuke Saruta] Fixed style
2db9fbf [Kousuke Saruta] Removed redirection from the logic which checks the existence of commands
1e4c7e0 [Kousuke Saruta] Used "command" command instead of "type" command
83b49b5 [Kousuke Saruta] Modified make-distribution.sh so that we use curl, not only wget to get tachyon

for details, see: https://issues.apache.org/jira/browse/SPARK-3745

Author: shane knapp <incomplete@gmail.com>

Closes #2596 from shaneknapp/SPARK-3745 and squashes the following commits:

c95eea9 [shane knapp] SPARK-3745 - fix check-license to properly download and check jar

...

Tested ! TBH, it isn't a great idea to have directory with spaces within. Because emacs doesn't like it then hadoop doesn't like it. and so on...

Author: Prashant Sharma <prashant.s@imaginea.com>

Closes #2229 from ScrapCodes/SPARK-3337/quoting-shell-scripts and squashes the following commits:

d4ad660 [Prashant Sharma] SPARK-3337 Paranoid quoting in shell to allow install dirs with spaces within.

In the Jenkins console output, `curl` gives us mountains of `#` symbols as it tries to show its download progress.

![noise from curl in Jenkins output](http://i.imgur.com/P2E7yUw.png)

I don't think this is useful so I've changed things to suppress these progress bars. If there is actually some use to this, feel free to reject this proposal.

Author: Nicholas Chammas <nicholas.chammas@gmail.com>

Closes #2279 from nchammas/trim-test-output and squashes the following commits:

14a720c [Nicholas Chammas] suppress curl/wget progress bars

Author: Prashant Sharma <prashant.s@imaginea.com>

Closes #125 from ScrapCodes/rat-integration and squashes the following commits:

64f7c7d [Prashant Sharma] added license headers.
fcf28b1 [Prashant Sharma] Review feedback.
c0648db [Prashant Sharma] SPARK-1144 Added license and RAT to check licenses.