#1 segue command does not parse

[Gordon Woodhull]

The segue command can cause parse errors, for example with tests/llel.incr (however suppress7th.incr is okay because it has line break between segue and the graph description, a viable workaround)

This has something to do with the agraph parser being spawned from within the incrface parser.

Somehow the incrface parser gets the 'd' and the agraph parser gets the 'igraph', causing two parse errors:

One is caught by the dynagraph error handling system:
message "(exception) Incrface syntax error: incr:
syntax error in line 3 near 'd'"

And one is caught by the agraph parser:
syntax error in line 1 near 'igraph'