Solved problem with multiple signature iteration

git-svn-id: http://jira.uji.es/repos/uji/CRYPTOAPPLET/branches/CryptoApplet_2.1.7_pdf@19567 e6edf6fb-f266-4316-afb4-e53d95876a76
Support for PDF visible signature placement. Now, we can choose between an specific page, ALL or LAST

git-svn-id: http://jira.uji.es/repos/uji/CRYPTOAPPLET/branches/CryptoApplet_2.1.7_pdf@19569 e6edf6fb-f266-4316-afb4-e53d95876a76