[PDI-11590]: Transformation Executor Step Result Rows Table has 2 Length Columns.

There is a fix.
[PDI-12671] - Switch / Case does not handle null values correctly - add default row set to list of null row sets if the latter is empty + small refactoring
[BACKLOG-336]: CLONE - "Start or Restart Job From Selected Job Entry Copy" button disabled in 5.1.0

The fix is just enable this button as it done for Start/Run button
This is a minor chnge in UI component.
[CLEANUP] - Fix issue with NPE when opening ModPartitionerDialog

This issue was introdused with changed
BaseStepDialog.setShellImage(BaseStepDialog.java:1388) algorytm. It
recieves StepMetaInterface in signature but does not pass it to private
mehtod. Private method assumes that BaseStepDialog has protected field
stepMeta.

Unfortatly, if child class (ModPartitionerDialog) also have stepMeta field
as a private field this will overloads parent class value. So this private
field must be removed.
[CLEANUP] - fix junit test avoid using obsolete asserts
PDI-12140 - junit tests provided

junit for different steps combination (regular step, step running in
multiple copies, partitioned steps)
PDI-12140 - IndexOutOfBoundsException when transitioning between different partition schemas

Fix transformation and BaseStep prepare execution logic.
For partitioning we had a case called 'Swim-lanes'. This is a case when we
have 2 steps partitioned with same partitioning schema. For swim-lines we
used to have N_to_N relationship. This is a special mapping when we used
to avoid extra buffers.
The issue was that when we use 2 steps with same patritioning count - but
different partitioning we used to treat this case as a swim lines by
mistake.
This was lead to IOB exception. This case could be workarounded using one
not partitioned step between.
But since we allow to put 2 differenly patritioned steps in line - we
should correctly handle this case. Even it is not optimal transformation
order lead to excessive rowsets.

This commit brings refactoring for steps rowsets relation discovery and
should fix IOOB exception.
BACKLOG-337 - CLONE - Excel Input step modifies the files it opens (Apache POI)
BACKLOG-337 - CLONE - Excel Input step modifies the files it opens (Apache POI) -test
BACKLOG-370 - CLONE - Mysql Bulk loader step minor corrections - added tests
BACKLOG-370 - CLONE - Mysql Bulk loader step minor corrections - format classes according to checkstyle
BACKLOG-370 - CLONE - Mysql Bulk loader step minor corrections - made corrections
BACKLOG-603 - CLONE - Field Type Selection box has a dubious blank entry at the end of the list, Copy/Paste is no longer working - CheckStyle
BACKLOG-603 - CLONE - Field Type Selection box has a dubious blank entry at the end of the list, Copy/Paste is no longer working
BACKLOG-605 - CLONE - Unable to remove job finished with errors from Carte Monitor page
Merge pull request #726 from Aliaksandr-Kastenka/BACKLOG-605

BACKLOG-605 - CLONE - Unable to remove job finished with errors from Car...
[PDI-12565][TEST] Test like Pattern Match
Merge pull request #729 from hudak/ThinUtilTest

[PDI-12565][TEST] Test like Pattern Match
Merge pull request #656 from TatsianaKasiankova/PDI-11590

[PDI-11590]: Transformation Executor Step Result Rows Table has 2 Length Columns.
Merge pull request #728 from SergeyTravin/BACKLOG-603

Backlog 603 - CLONE - Field Type Selection box has a dubious blank entry at the end of the list, Copy/Paste is no longer working