PDI-10909 - Email message input: retrive the first ... emails

junit tests added
PDI-10909 - Email message input: retrive the first ... emails

Fix added. 
Retrieve first ... emails will be applied only if folder is non dynamic
Limit value overrides retrieve first ... emails value
[PDI-10774] Load file content in memory step: Wildcard not preserved after save
PDI-7426 - [PATCH] Subfolders for IMAP for Jobentry 'Get mails' and Transformation Step 'Email messages input'

junit tests added

new file:   engine/test-src/org/pentaho/di/job/entries/getpop/MailConnectionTest.java
PDI-7426 - [PATCH] Subfolders for IMAP for Jobentry 'Get mails' and transformation Step 'Email messages input'

patch applyed
[PDI-8870] NPE on Concat step when remove selected fields AND header row are checked
Merge pull request #281 from pavel-sakun/checkstyle-separate-targets-by-report-type

Split checkstyle target into 2 targets based on resulting report type
Merge pull request #219 from stepanovdg/PDI-10744

[PDI-10774] Load file content in memory step: Wildcard not preserved aft...
Merge pull request #214 from prakapenka/PDI-10909

PDI-10909 - Email message input: retrive the first ... emails
Merge pull request #233 from prakapenka/PDI-7426

[PATCH] Subfolders for IMAP for Jobentry 'Get mails' and Transformation Step 'Email messages input'
Merge pull request ##298 from stepanovdg:PDI-8870

[PDI-8870] NPE on Concat step when remove selected fields AND header row are checked
[PDI-11467] - Adding support for Arrays in load/save testing, load/save tests for HTTP, HTTPPost, Rest steps
[PDI-11467] - Obfuscating trust store password
Merge pull request #312 from brosander/PDI-11467

Pdi 11467
PDI-6976 - The Load Content into Memory Step reports an error on check, even though it is setup correctly