textproc/dblatex: update to 0.3.11py3 release

Switch to py35+ and disable flavors for this port

Changes since 0.3.9 release:

• Fork dblatex to work with Python > 3.2

• Add the ability to set images for front and back covers
• Add the ability to pass several configuration files (-c option)
• Fix Debian bug #840189: drop dependency on the latex package 'multirow'
• Fix Debian bug #849679: wrong character entities in el.xml
• Fix Debian bug #851145: put the paragraph title on a separate line
• Fix Debian bug #863527: remove active babel character.
• Fix Debian bug #866716: make dblatex robust to non-ascii xml:id
• Fix bug #114: don't skip usefull spaces in hyphenated strings

PR: 244400 (based on)
Submitted by: m DOT ne AT gmx DOT net