[PDI-12413] Reverting SpringSecurityPrincipalProvider enhancements due to bad Authentication objects being re-used (still unknown why). Also PentahoSystem.runAsSystem now behaves like SecurityHelper.runAsSystem
Merge pull request #1630 from pentaho-nbaker/master

[PDI-12413] Reverting SpringSecurityPrincipalProvider enhancements due t...
Merge pull request #1632 from mdamour1976/master

[BISERVER-11745] Editing a blockout does not preserve the duration
[CLEANUP] - Removing orig file from welcome screen
[PDI-12413] Adding default for singleTenantAdminUserName in case one is not supplied.
[BISERVER-10858] file icons for KTR onyx theme
Merge pull request #1635 from scottyaslan/dev

[BISERVER-10858] file icons for KTR onyx theme
Merge pull request #1634 from webdetails/cleanup

[CLEANUP] - Removing orig file from welcome screen
[BISERVER-11722] Roles with special characters do not retain their Operation Permissions
Merge pull request #1637 from pminutillo/localdev

[BISERVER-11722] Roles with special characters do not retain their Opera...
[PDI-12418] - removed execute perms for power user as execute permission lifecycle manager adds the perms for power user
Merge pull request #1638 from pentaho-skarmali/PDI-12418_execute_perms_not_persisted_on_authenticate_role

[PDI-12418] - removed execute perms for power user as execute permission...
[BISERVER-11751] - IE: Couldn't upload files in Browse perspective
Merge pull request #1640 from jeffreythomas/dev

[BISERVER-11751] - IE: Couldn't upload files in Browse perspective