Merge pull request #140 from emorency/master

OPAL-1744 and OPAL-1754
Change logging
Add @Nonnull
Fix PMD & Findbugs warnings
Remove prefix
Fix OPAL-1753: Unit cannot be selected when importing data in other format than CSV
Made whole-word search on variable name possible.
Merge pull request #141 from kazoompa/master

Enhancement
OPAL-1723 - added TextCell when importing
Merge pull request #142 from kazoompa/bug-OPAL-1723

OPAL-1723 - added TextCell when importing
OPAL-1728 - added the IP taken from HttpServletRequest
Merge pull request #143 from kazoompa/bug-OPAL-1728

OPAL-1728 - added the IP taken from HttpServletRequest
Fix warnings
Fix OPAL-1751: Avoid binaries upgrade on every start
OPAL-1755 - added 'AND' as default query operator
Merge pull request #144 from kazoompa/feature-OPAL-1755

OPAL-1755 - added 'AND' as default query operator
OPAL-1733 - no longer changing cursors since there is already a progressbar indicating lengthly index operations
Merge pull request #145 from kazoompa/bug-OPAL-1733

OPAL-1733 - no longer changing cursors since there is already a progress...
Fix PMD & Findbugs warnings
Fix OPAL-1757: Drop table is slow even for empty tables