Fix FindBugs warnings
Work on OPAL-406: Allow users to specify whether or not to copy null values during copy executions.
- Fix on OPAL-406: Allow users to specify whether or not to copy null values during copy executions.
- Add @Nullable/@Nonnull on Value
MAGMA-205 - Converted category so it matches the variable type
Merge pull request #14 from kazoompa/bug-MAGMA-205

MAGMA-205 - Converted category so it matches the variable type
Analyse variables when needed
Update PMD and use Obiba convention PMD ruleset
Fix PMD warnings
Validate variable types
Analyse variables as soon as possible
Add @Nullable/@Nonnull
Don't analyse variables on getTables()
Fix PMD warnings
Format code