PDFBOX-2516 move setValue to individual field types

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1641568 13f79535-47bb-0310-9956-ffa450edef68
PDFBOX-2516 correct examples

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1641588 13f79535-47bb-0310-9956-ffa450edef68
PDFBOX-1675: fix typo

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1641648 13f79535-47bb-0310-9956-ffa450edef68
PDFBOX-1675: improve error messages

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1641649 13f79535-47bb-0310-9956-ffa450edef68
PDFBOX-1675: code cleanup

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1641654 13f79535-47bb-0310-9956-ffa450edef68