The define of TCPDF constants was causing an error (Constant PDF_PAGE_FORMAT etc. already defined), if you use TCPDF within own plugins and use the print PDF feature of LS.
The if-statement, avoid the error, if the constant is tried to define again.
Merge pull request #192 from KRav007/KRav-Develop

The define of TCPDF constants was causing an error
Updated translation: Portuguese (Portugal) by cmcsilvaster, PauloJFMartins, samarta
Updated translation: Hungarian by lukacs
Updated translation: Romanian by christianC, filipguttman
Updated translation: Albanian by florianika
Release 2.05+ Build 140422
Changed feature: Added xslx and docx to allowed filed extensions for resources
Updated translation: German by c_schmitz
Updated translation: Romanian by christianC, filipguttman
Updated translation: German (Informal) by c_schmitz
Updated translation: Arabic by sessid
Updated translation: Lithuanian by simasj
Updated translation: Dutch by jurjenn, Han
Updated translation: Dutch (Informal) by Han
Fixed issue #8997
Updated translation: Catalan by jmontane, valdomir
Fixed issue #9010: Survey list no longer reads "No active surveys"
Fixed issue: SQLSRV database type not support for install command
Fixed issue #9015: Wrong quote escaping for translated text in file upload processing
Fixed issue #9004: Cannot create new attributes with participant CSV import
Fixed issue #9008: RPC call to export_statistics works only if you are the owner of the survey
Fixed issue #9009: Unchecking "Allow this user to edit these participants" creates shares with edit privleges
Fixed issue #9016: Redundant "File count" text before actual value displayed in response records
Fixed issue #9007: Crash when an user wants to create a new survey
Updated translation: Catalan by jmontane, valdomir
Updated translation: Serbian by zlukovic, MilaVeljovic
Release 2.05+ Build 140502