New Quearl/XML branch

Migrating output to XML instead of HTML 4.0; original branch now known as
Quearl/HTML.
First Quearl/XML release

Reached parity with Quearl/HTML v1.0.0 .
Improve user profile page, update legalese
Last Quearl/XML release

Browser support for XML and XSLT is too inconsistent for a full-scale web
site; Quearl/XML will be converted to Quearl/XHTML, since XHTML has much
better support.
First Quearl/XHTML release
Add EComm.Orders system
Add template system
Use templates for markup chunks
QlType improvements
Rewritten all JS pretty much from scratch
Add remotely-sortable EComm.QlProductTable
UI improvements
Add "legal" template
Last Quearl/HTML release

Development moved entirely to Quearl/XHTML.
Merge branch 'quearl_xhtml'

End of separated Quearl/HTML and Quearl/XHTML development.
Add EComm.Shippings
Backend improvements (log, stats)

- Statistics collection
- XHTML log
- ql_str_syntaxhighlight() (not used yet)
- Many, many other small changes and fixes