support including other QBK files via [include other.qbk]

svn path=/branches/QUICKBOOK_INCLUDE/boost/tools/quickbook/; revision=29071
fix up doc_id when parsing an included QBK file to keep links from breaking

svn path=/branches/QUICKBOOK_INCLUDE/boost/tools/quickbook/; revision=29072
escape uri

svn path=/branches/QUICKBOOK_INCLUDE/boost/tools/quickbook/; revision=29101
macros are scoped to the file in which they are defined, update __FILENAME__ macro for included files

svn path=/branches/QUICKBOOK_INCLUDE/boost/tools/quickbook/; revision=29152
fix signed/unsigned mismatch

svn path=/branches/QUICKBOOK_INCLUDE/boost/tools/quickbook/; revision=29161
[include] has optional :doc_id argument, fix doc_type include bug

svn path=/branches/QUICKBOOK_INCLUDE/boost/tools/quickbook/; revision=29175
fix relative path handling in [include]s

svn path=/branches/QUICKBOOK_INCLUDE/boost/tools/quickbook/; revision=29495
disallow zero-character identifiers

svn path=/branches/QUICKBOOK_INCLUDE/boost/tools/quickbook/; revision=29497
add support for <emphasis role=strikethrough> with [-stuff] syntax

svn path=/branches/QUICKBOOK_INCLUDE/boost/tools/quickbook/; revision=29659
add simple -strikethrough- formatting

svn path=/branches/QUICKBOOK_INCLUDE/boost/tools/quickbook/; revision=29660
updated docs

svn path=/branches/QUICKBOOK_INCLUDE/boost/tools/quickbook/; revision=29661
complete docs for strikethrough and include

svn path=/branches/QUICKBOOK_INCLUDE/boost/tools/quickbook/; revision=29708
update quickbook.xml

svn path=/branches/QUICKBOOK_INCLUDE/boost/tools/quickbook/; revision=29711