add and throw out pairs

[GoogleCodeExporter]

Currently an "undocumented feature" allows to add pairs temporarily to the
right of a subgroup. These pairs however are soon forgotten. 

See for example trapgevel on
http://code.google.com/p/bobbinwork/source/browse/wiki/diagrams?r=606
This diagram is as far is it can get: already the gimp and another pair
show discontinuation gaps. Adding more stitches below can only let pairs go
all the wrong way.

Throwing out pairs is not implemented at all. 

Original issue reported on code.google.com by bobbin.w...@gmail.com on 2 Feb 2010 at 9:03

[GoogleCodeExporter]

It looks like the ins and out of the Bounds and Connectors (
http://code.google.com/p/bobbinwork/source/browse/trunk/src/main/java/nl/BobbinW
ork/diagram/model/
) should become sub lists of the top level group (
http://bobbinwork.googlecode.com/svn-history/r606/trunk/doc/class-diagrams3.htm 
) 
However, when a stitch or group makes structural changes (inserts or deletes a
segment alias bobbin) to the top level list through its own sublist, the 
sublists of
siblings of the stitch or group may be come useless. See the javadoc for
AbstractList.subList() and http://forums.sun.com/thread.jspa?threadID=5396552

Original comment by bobbin.w...@gmail.com on 2 Feb 2010 at 11:44

[GoogleCodeExporter]

a hunch: only apply sublists for the outs of connectors. Perhaps the ins then 
would
only be needed for the bounds and no longer for the connectors.

Original comment by bobbin.w...@gmail.com on 5 Feb 2010 at 4:45