OPAL-1849 Reuse limit setting when going from one variable to another.
Changing value type icons for bootstrap icons and centering polygon and linestrings on map.
Merge pull request #200 from emorency/feature/map-icons-center

Changing value type icons for bootstrap icons and centering polygon and ...
Show next/previous buttons when number of variables exceeds the max number of visibles variables selected.
Merge pull request #201 from emorency/feature/values-table-next-previous

Show next/previous buttons when number of variables exceeds the max numb...
magma version 1.7.0
Feature popup commented.
Missing map tile added.
[maven-release-plugin] prepare branch opal-1.15.x
[maven-release-plugin] prepare for next development iteration
Bootstrap layout introduced.

Conflicts:

	opal-gwt-client/src/main/java/org/obiba/opal/web/gwt/app/client/navigator/event/DatasourceSelectionChangeEvent.java
	opal-gwt-client/src/main/java/org/obiba/opal/web/gwt/app/client/navigator/presenter/NavigatorTreePresenter.java
	opal-gwt-client/src/main/java/org/obiba/opal/web/gwt/app/client/navigator/view/NavigatorView.java
OPAL-1886 Workbench layout first commit.