change mode for some Asian languages
PHPDocs, undefined vars, unused var
include conf var, change MPDF temp path defines

to default dokuwiki locations
update usage of http_sendfile. Fixes #104
add html debug option
export pages in a given namespace to pdf

Fixes #59

urlparameters:
- do=export_pdfns
- pdfns_ns=name:space
- pdfns_title=Test+title
optional:
- pdfns_order=date (accepts: natural(default), date or pagename)
- pdfns_depth=1 (accepts: positive numbers, default 0)
bit refactoring
Merge pull request #130 from splitbrain/devel

export ns, mode change, defines, debughtml, minor