DEV-358: Apply existing patch for tagged paragraph element support to iTextCore
Added failing test. to be fixed
Added TabSpace chunks for DEV-311 and tests.
Tagged PDF changes: 
1) Added support for nested structure elements
2) Added support for span elements
Fixed bug in incorrect sequence if BDC/BT/EMC/ET
Working around a bug in BouncyCastle (as suggested by Alfonso Massa on the mailing list on October 9th, 2012).
Appended xref streams could hide new objects.
The workaround for the bug in BouncyCastle doesn't work for me.
DEV-367 XMLWorker nosuchelementexception
Fixed test
Added more changes for tagged PDF support. But they are disabled by some if-else statements for now.
Reverted revision 5489 because of failing tests
DEV-367 XMLWorker nosuchelementexception
Added more changes for tagged PDF support. But they are disabled by some if-else statements for now.
Fixed SVN merging issue (Tagged PDF support)
DEV-367 XMLWorker nosuchelementexception. I hope this is the final fix!!!
Added paragraph tagged attributes (DEV-359)
Fix for tagged attributes (DEV-359)
add low level filtering hook