make @<hd> hyperlink when --chapterlink is specified.
initial INAOBuilder implementation.
Add test for INAOBuilder
Break paragraph when encounting ===+
Merge branch 'master' into inaobuilder
Add tests for inaobuilder
Enable to output files in PART
Enable to use 'label' to identify inline_hd. Ref #116
fix #158  use us-ascii as literal encoding explicitly
Add description about inline_hd
Add number to POSTDEF files
Add require
Nil check
use own header handling for column-header instead of headline, to avoid misnumbering in HTMLBuilder.
Not to add number when PREDEF
Not to use number prefix in appendix
Not to use number prefix in appendix
Fix pathname syntax error
Enable to create Epub with part_files
Enable comment to include block comment. Ref #161