Changes

Fixed faustedition/faust-gen-html#51
* src/main/web 87ccf45...586498e (1):
 > Support joined lines in variant app.
* src/main/xproc 1ff8a45...06ea644 (5):
 > Actually display joined lines side by side
 > Support output-group="_" for multiverses
 > HTML handling is now in htmlcommon.xsl
 > Fixed id in #51 case
 > Additional app for lines with n="n1 n2"
 (commit: 29a915c)