added a second constructor to build a MetaBox with
a set of preset values
loadQuery() also produces MetaBoxes
after a little rethinking ... I thought ... we should leave the constructor the way it was and build two methods setValue(), one for a collection of values, one for a single string
new constructor: SpanBox can be build with a predefined value for the reBox
new constructor: SpanBox can be build with a predefined value for the reBox and for negativeSearch
same as in SearchBox:

predefined boolean value for regular expression and for negativeSearch
fixed some further problems with the constructor (deleted the unnecessary one).
There are now two constructors:
VN(String, FlatQueryBuilder)
VN(String, String, FlatQueryBuilder, boolean, boolean)
small corrections
changed deprecated method
fixed/improved setValue():
if the value is not contained, it has to be added.
This is only the case for regex.
loadQuery() improved,
escaped regex-chars are unescaped
the thing, that happened to SpanBox.setValue();
SpanBox and SearchBox:

repaired a minor mistake -->now: cb.TextInputAllowed(true)
bug in method unescape() fixed:

mixed up "\x2F" with "\2xF"
when the SpanBox is deleted, the menu text becomes "add" again
now the user is able to type in user defined EdgeOperators.
Next step: validate user defined operators
removed a line
added method initialize
next steps: remove buttons, remove entries in buttonClick()
repaired setValue()
unnecessary code escaped