Get CPLEX location (include and libdir) from the environment.
(On lemon.cs.elte.hu use "cplex_env" command to set the environment
appropriately.)

Some callbacks are still unimplemented

Previous commit was also mine, but I forgot to say, that it was my younger brother's birthyear. From this commit texts of activated maps move together with red arrows.

Sorry for my friday afternoon...

Little beauty fault is corrected.

Three commits, one after the other! 81 is my, 82 is my fiancee's, 83 is my younger sister's birthyear :) In this commit Alpar's wish came true: editorial buttons are now available directly on toolbar.

Very small bug is corrected: if node creator tool is active, the small red arrows won't move, if you click on them and if you drag the newly created node... 'was hard to notice it :-)

First of all: revision 1981 is mine, what is important me because I was born in 1981. But what is new in my revision? If you drag nodes with left button, edge-breakpoints do not change location. If you drag nodes by right button, they do, they take up their base situation at the halfpoint of the edge.

Little red arrows appear in breakpoints of edges.

Redundant files are removed, sorry.

Broken edges are appearing.

At last, the most simple task, the graph-item deletion is solved...

removed dependencies

gcc-4.0 compatibility changes
coloring.cc still generates warnings. Don't know why.