Additional definition modification keywords

[kosch]

As user I want to create new defines or append facts in one single row w/op c&p the previous content.

e.g.
.define foobar is also xyz

should create fact foobar with content xyz if not exists. If fact foobar already exists, the new fact should be added using a delimiter, maybe |.

example:
.define foobar
=> sorry, no definition found...
.define foobar is also xyz
=> definition of "foobar" created
.define foobar is also abc
=> definition of "foobar" updated
.define foobar
=> foobar: xyz | abc

Optional an keyword like "forget" can remove additional facts if the string between limiters matches:

example:
.define foobar forget abc
=> definition of "foobar" updated
.define foobar
=> foobar: xyz
.define foobar forget zzz
=> error no such fact on "foobar"

[XenGi]

.define foo bar | baz

Maybe the removal can be triggered by the Nth entry. So instead of using:

.define foo forget bar

You could write:

.define foo forget 0