Update doctokenizer.l

Added support for Subversion fixed-length keyword syntax (see: http://sourceforge.net/p/doxygen/discussion/130996/thread/1c641a9f/).
List only the project pages in "Related Pages"

This avoids cluttering "Related Pages" with links to pages from external
projects.
Bug 726722 - Blockquote followed by text inserts an extra paragraph

Remove superfluous \n from intermediate output.
Merge pull request #137 from agateau/wip/list-only-own-pages-in-related-pages

List only the project pages in "Related Pages"
Merge pull request #139 from rkawulak/patch-2

Update doctokenizer.l
Merge pull request #143 from albert-github/feature/bug_726722

Bug 726722 - Blockquote followed by text inserts an extra paragraph