Fix IPMC checks for releasing.

* Update docs for alpha release

* Delete a comma.

* Update How-to-build.md

* Add data-set licenses file

* Rename LICENSES-data-set to LICENSE-data-set

* Update LICENSE

* Remove fastclick from LICENSE

* Make the git submodule command to be a maven profile plugin. Let this command not execute by default install command.

* [maven-release-plugin] prepare release apm-5.0.0-alpha

* [maven-release-plugin] prepare for next development iteration

* Product name is not correct

* Add more documents for release.

* Change profile id.

* Add CHANGES file in distribution file.

* Revert "[maven-release-plugin] prepare for next development iteration"

This reverts commit ac815019.

* Revert "[maven-release-plugin] prepare release apm-5.0.0-alpha"

This reverts commit 095597c9.

* Add rat plugin to check dependency license and add license head into missing files.

* Fix docs.

* Exclude web ui config file.

* Next release guide.

* UI update.

* Update docs.

* Build source shell.

* [maven-release-plugin] prepare release apm-5.0.0-alpha

* [maven-release-plugin] prepare for next development iteration

* Fixed #920

* Sync sub module.

* 1. Add transaction average duration, business transaction average duration, MQ transaction average duration into all metric entities, DAO define, persistence DAO.
2. Add formula calculate operation.

* Refactor the package name in storage module, make the table define and dao package’s name same as others.

2. Add column named service_name_keyword into service_name elastic search table by the type of keyword.

Fix assmbly for mvn clean install -Papache-release and update version to SNAPSHOT for SNAPSHOT release.

Use DecimalFormat to replace DecimalFormat because of DecimalFormat will add a comma in formatted result when value greater than 1000.

Close GraphNodeFinder#findNode, if need to build a graph across modules, it is module/provider 's responsibility, who add node, who provides service to continue after this node.