PDFBOX-1329: Move page size constants from PDPage to PDRectangle, and clean up PDPage.

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1633490 13f79535-47bb-0310-9956-ffa450edef68
PDFBOX-1329: Removed comment

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1633492 13f79535-47bb-0310-9956-ffa450edef68
PDFBOX-2333 enhance alignment for single line text fields

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1633495 13f79535-47bb-0310-9956-ffa450edef68
PDFBOX-2423: Clean up PDDocumentCatalog formatting

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1633496 13f79535-47bb-0310-9956-ffa450edef68
PDFBOX-2423: Made page mode and layout constants in PDDocumentCatalog into enums

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1633501 13f79535-47bb-0310-9956-ffa450edef68