Initialize 1.7 development branch
Clean conref XSLT

Update test suite for conref.
Fix testsuite
Update testsuite
Fix conref error message on missing target #1316
Document XHTML TOC generation arguments
Fix doc typo
Add HTML5 output #1144

The UI generated by the HTML5 stylesheets does not
differ from HTML or XHTML output, this commit merely
adds HTML5 doctype.

Add args.xhtml.toc.xsl to allow setting TOC generation
stylesheet.
Refactor XHTML and Eclipse help property init #1317

Move common property initialization to *.init targets
and separate XHTML and Eclipse help args.xsl processing.
Fix documentation for memory management
Add internal Ant properties to developer documentation
Remove dita.input and dita.input.dirname arguments #1319
Fix path2project separator clean-up #1321

Reimpelement path2project PI Windows separator clean-up.
Change String paths to be a File object #1324
Add fixed table layout property to FOP stylesheets #1323

Add priority to choice table templates to remove priority error messages.
Fix Hebrew index see also string in PDF2 #1325
Process id in table cells in HTML #1322
Remove redundant namespaces declarations and entities
Change String paths to File objects #1324
Document and fix Javadoc