Merge pull request #122 from emorency/feature/opal-1681-filter-variables

OPAL-1681: Filter variables
Upgrade GWT modules
Revert GWTP to 0.6
Upgrade dependencies
Fix warnings
Prepare ES variable summaries index
Add VariableSummariesMapping
Fix typo
Add CategoricalVariableSummary builder
Prepare Summary computation on values indexation
Move Categorical summary test
- Depends on obiba-commons 1.4-SNAPSHOT
- Index summaries on values indexation
Rename SummariesIndex to StatsIndex
OPAL-1703 - implemented service for searching variables of a specific table
Merge pull request #123 from kazoompa/feature-OPAL-1703

OPAL-1703 - implemented service for searching variables of a specific ta...
Use OPAL_USER to define owner of TMPDIR
OPAL-1710: Removed method hasTask, getting directly the currentTask and check if null
Merge pull request #124 from emorency/feature/opal-1710-hastask

OPAL-1710: Removed method hasTask, getting directly the currentTask and ...
OPAL-1722 gwt_overlay modified.
- Use Magma 1.6-SNAPSHOT
- Work on summary indexation