Changes

Don't use xlink namespace for svg:use/@href.
xlink:href on svg:use is deprecated, and browsers seem to have a problem 
with that when the svg is included via ajax.
Fixes #14.
 (commit: 8ecfcc6)

Updated submodules
Submodule data 2063168..3f2e4d9:
 >  Updated xml files Submodule src/main/web b4ecfc96..c118002e:
 > Fixed #348, fixup to #331
 > More apparatus formatting Submodule src/main/xproc
4100a45d..02315649:
 > Make sure we have a stored copy of the reading text
 > generate-search requires the reading text ...
 > Generating the reading text now requires the list of transcripts.
 > Improved validation report
 > Links to faust.all & formatting
 > More help for errors
 > Amend watermark-labels
 > Utilities for selecting stuff.
 > fixup! made app2xml.py a little more robust
 > made app2xml.py a little more robust
 > more app validation
 > Put hand info inline in the apparatus
 > Add a validation script for the apparatus.
 > Calculate reproducable ID for app entries
 > Generate list of witnesses used for reading text
 > Update app2norm, hopefully fixing most errors
 > Adjusted lemma parsing
 > Support lg/@rend case
 > fixup! Stage at end of sp after sp
 > suppress "bullet3" cases in app1norm, update app1norm.tf accordingly
 > store test cases from app2norm
 > Update app2norm.txt
 > Merge branch 'master' of
https://github.com/faustedition/faust-gen-html
 > Add section for all non-interventions
 > Merge branch 'master' of
https://github.com/faustedition/faust-gen-html
 > Update app2norm
 > prevent double ^^ in app1norm.txt
 > Whitespace for multiple witnesses / readings
 (commit: 3008eea)